"EDID checksum is invalid"

"EDID checksum is invalid"

[Linus Torvalds]

So my el-cheapo UHD Dell monitor is unhappy with dmps, and just never
wakes up from it.

I work around it with just doing "xset -dpms" and it's not a big deal,
but I thought I'd report it anyway, since there are actual debug
messages, and maybe there's a better way to handle it. Does anybody
have any idea of why it would do this:

   [drm:drm_edid_block_valid [drm]] *ERROR* EDID checksum is invalid,
remainder is 111
   Raw EDID:
    00 ff ff ff ff ff ff 00 10 ac 5c f0 4d 54 31 41
    24 18 01 03 80 3e 22 78 ea 0a a5 a2 57 4f a2 28
    0f 50 54 a5 4b 00 71 4f 81 00 81 80 a9 40 b3 00
    d1 c0 d1 00 7f ff ff ff ff ff ff ff ff ff ff ff
    ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
    ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
    ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
    ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff

   [drm:drm_edid_block_valid [drm]] *ERROR* EDID checksum is invalid,
remainder is 240
   Raw EDID:
    00 ff ff ff ff ff ff 00 10 ac 5c f0 4d 54 31 41
    24 18 01 03 80 3e 22 78 ea 0a a5 a2 57 4f a2 28
    0f 50 54 a5 4b 00 71 4f 81 00 81 87 ff ff ff ff
    ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
    ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
    ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
    ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
    ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff

   [drm:drm_edid_block_valid [drm]] *ERROR* EDID checksum is invalid,
remainder is 35
   Raw EDID:
    00 ff ff ff ff ff ff 00 10 ac 5c f0 4d 54 31 41
    24 18 01 03 80 3e 22 78 ea 0a a5 a2 57 4f a2 28
    0f 50 54 a5 4b 00 71 4f 81 00 81 80 a9 40 b3 00
    d1 c7 ff ff ff ff ff ff ff ff ff ff ff ff ff ff
    ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
    ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
    ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
    ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff

   [drm:drm_edid_block_valid [drm]] *ERROR* EDID checksum is invalid,
remainder is 212
   Raw EDID:
    00 ff ff ff ff ff ff 00 10 ac 5c f0 4d 54 31 41
    24 18 01 03 80 3e 22 78 ea 0a a5 a2 57 4f a2 28
    0f 50 54 a5 4b 00 71 4f 81 00 81 80 a9 40 ff ff
    ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
    ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
    ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
    ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
    ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff

it looks like the beginning is the same, but then it just turns to all
ones at a random point (even *within* a byte).

Does anything spring to mind?

                     Linus
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Re: "EDID checksum is invalid"

[Keith Packard]

[-- Attachment #1.1: Type: text/plain, Size: 405 bytes --]

Linus Torvalds <torvalds@linux-foundation.org> writes:

> it looks like the beginning is the same, but then it just turns to all
> ones at a random point (even *within* a byte).

Looks like the EDID ROM is dropping off the i2c bus in the middle of the
transfer. Wonder if it's being 'clever' if things go too slowly at some
point, or if there's a bug in the DDC code that's in use.

-- 
-keith

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Re: "EDID checksum is invalid"

[Robert Morell]

On Tue, Jan 06, 2015 at 10:07:58PM -0800, Keith Packard wrote:
> * PGP Signed by an unknown key
> 
> Linus Torvalds <torvalds@linux-foundation.org> writes:
> 
> > it looks like the beginning is the same, but then it just turns to all
> > ones at a random point (even *within* a byte).
> 
> Looks like the EDID ROM is dropping off the i2c bus in the middle of the
> transfer. Wonder if it's being 'clever' if things go too slowly at some
> point, or if there's a bug in the DDC code that's in use.

FWIW, I've seen that exact symptom on some monitors when the +5V pin on
the DVI or HDMI cable from the GPU isn't enabled (or isn't providing
enough current).  Some monitors power the i2c/edid/DDC logic from that
+5V either exclusively or when in the DPMS off state, and the i2c chip
will just stop responding after a few cycles if not provided sufficient
power.

- Robert
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Re: "EDID checksum is invalid"

[Keith Packard]

[-- Attachment #1.1: Type: text/plain, Size: 618 bytes --]

Robert Morell <rmorell@nvidia.com> writes:

> FWIW, I've seen that exact symptom on some monitors when the +5V pin on
> the DVI or HDMI cable from the GPU isn't enabled (or isn't providing
> enough current).  Some monitors power the i2c/edid/DDC logic from that
> +5V either exclusively or when in the DPMS off state, and the i2c chip
> will just stop responding after a few cycles if not provided sufficient
> power.

Makes sense -- the chip will power itself from the i2c when not
transmitting, and can talk until whatever energy is stored in various
capacitors on the Vcc rail discharge.

-- 
-keith

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Re: "EDID checksum is invalid"

[Linus Torvalds]

On Tue, Jan 6, 2015 at 10:21 PM, Robert Morell <rmorell@nvidia.com> wrote:
>
> FWIW, I've seen that exact symptom on some monitors when the +5V pin on
> the DVI or HDMI cable from the GPU isn't enabled (or isn't providing
> enough current).  Some monitors power the i2c/edid/DDC logic from that
> +5V either exclusively or when in the DPMS off state, and the i2c chip
> will just stop responding after a few cycles if not provided sufficient
> power.

That makes a ton of sense, especially the "when in DPMS off state" case.

I'll do the drm.debug=0xe thing, and maybe Daniel can make more sense
of the details. Maybe the i2c driver ends up powering down too soon
(or maybe  it needs to power up a bit earlier)?

This is a bog-standard intel motherboard (DH87RL), but I actually
needed to update the BIOS for it to get it to POST reliably with this
monitor. I was blaming that on the odd 3840x2160@30Hz mode, but maybe
it's related to the EDID being finicky wrt i2c power.

I'm assuming even the hdmi +5V line is under sw control at least for
power management reasons. Maybe dpms off turns it off, and shouldn't?
My monitor actually says "No HDMI (HML) Cable" when I do "xset dpms
force off". Maybe that's normal, but maybe that's indicative of dpms
turning things a bit *too* off?

                             Linus
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Re: "EDID checksum is invalid"

[Daniel Vetter]

On Wed, Jan 7, 2015 at 6:07 PM, Linus Torvalds
<torvalds@linux-foundation.org> wrote:
> On Tue, Jan 6, 2015 at 10:21 PM, Robert Morell <rmorell@nvidia.com> wrote:
>>
>> FWIW, I've seen that exact symptom on some monitors when the +5V pin on
>> the DVI or HDMI cable from the GPU isn't enabled (or isn't providing
>> enough current).  Some monitors power the i2c/edid/DDC logic from that
>> +5V either exclusively or when in the DPMS off state, and the i2c chip
>> will just stop responding after a few cycles if not provided sufficient
>> power.
>
> That makes a ton of sense, especially the "when in DPMS off state" case.
>
> I'll do the drm.debug=0xe thing, and maybe Daniel can make more sense
> of the details. Maybe the i2c driver ends up powering down too soon
> (or maybe  it needs to power up a bit earlier)?
>
> This is a bog-standard intel motherboard (DH87RL), but I actually
> needed to update the BIOS for it to get it to POST reliably with this
> monitor. I was blaming that on the odd 3840x2160@30Hz mode, but maybe
> it's related to the EDID being finicky wrt i2c power.
>
> I'm assuming even the hdmi +5V line is under sw control at least for
> power management reasons. Maybe dpms off turns it off, and shouldn't?
> My monitor actually says "No HDMI (HML) Cable" when I do "xset dpms
> force off". Maybe that's normal, but maybe that's indicative of dpms
> turning things a bit *too* off?

Not sure whether that'd be the same voltage rails, but
i915.disable_power_wells=0 disable all the runtime pm we do (which
does kick in for dpms off and shut down the entire display block and a
bunch more). Maybe we just need to detect that the chip dropped off
the bus and retry after 50ms (to give the caps some time to charge).
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch
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Re: "EDID checksum is invalid"

[Linus Torvalds]

On Wed, Jan 7, 2015 at 9:51 AM, Daniel Vetter <daniel@ffwll.ch> wrote:
>
> Not sure whether that'd be the same voltage rails, but
> i915.disable_power_wells=0 disable all the runtime pm we do (which
> does kick in for dpms off and shut down the entire display block and a
> bunch more)

I still get the "No HDMI (MHL) Cable" with that kernel command line,
and the same failure to come back after an extended dpms off.

So it doesn't seem to be related to the runtime pm you do on a chip level.

         Linus
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Re: "EDID checksum is invalid"

[Keith Packard]

[-- Attachment #1.1: Type: text/plain, Size: 788 bytes --]

Linus Torvalds <torvalds@linux-foundation.org> writes:

> I'm assuming even the hdmi +5V line is under sw control at least for
> power management reasons. Maybe dpms off turns it off, and shouldn't?
> My monitor actually says "No HDMI (HML) Cable" when I do "xset dpms
> force off". Maybe that's normal, but maybe that's indicative of dpms
> turning things a bit *too* off?

How about getting a breakout cable so we can actually check the +5V
line to see when it turns off?

Total Phase makes one, although they only have the DVI ones in stock. A
couple of HDMI to DVI converters would let you use this.

        http://www.totalphase.com/products/video-dvi/

I've even got an i2c protocol sniffer if you want to see what's going on
the DDC bus directly.

-- 
-keith

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Re: "EDID checksum is invalid"

[Daniel Vetter]

On Wed, Jan 7, 2015 at 3:01 AM, Linus Torvalds
<torvalds@linux-foundation.org> wrote:
> So my el-cheapo UHD Dell monitor is unhappy with dmps, and just never
> wakes up from it.
>
> I work around it with just doing "xset -dpms" and it's not a big deal,
> but I thought I'd report it anyway, since there are actual debug
> messages, and maybe there's a better way to handle it. Does anybody
> have any idea of why it would do this:

Yeah if the edid probe fails userspace will get a hotplug and
autodisable the output. With a failsafe X session (just a dumb
terminal) we can avoid that to check that dpms on itself would work or
whether the edid probe fail here is just indicative of more trouble.
Also please boot with drm.debug=0xe, repro and grab dmesg, that might
shed some more light on what's failing.

Thanks, Daniel

>    [drm:drm_edid_block_valid [drm]] *ERROR* EDID checksum is invalid,
> remainder is 111
>    Raw EDID:
>     00 ff ff ff ff ff ff 00 10 ac 5c f0 4d 54 31 41
>     24 18 01 03 80 3e 22 78 ea 0a a5 a2 57 4f a2 28
>     0f 50 54 a5 4b 00 71 4f 81 00 81 80 a9 40 b3 00
>     d1 c0 d1 00 7f ff ff ff ff ff ff ff ff ff ff ff
>     ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>     ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>     ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>     ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>
>    [drm:drm_edid_block_valid [drm]] *ERROR* EDID checksum is invalid,
> remainder is 240
>    Raw EDID:
>     00 ff ff ff ff ff ff 00 10 ac 5c f0 4d 54 31 41
>     24 18 01 03 80 3e 22 78 ea 0a a5 a2 57 4f a2 28
>     0f 50 54 a5 4b 00 71 4f 81 00 81 87 ff ff ff ff
>     ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>     ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>     ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>     ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>     ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>
>    [drm:drm_edid_block_valid [drm]] *ERROR* EDID checksum is invalid,
> remainder is 35
>    Raw EDID:
>     00 ff ff ff ff ff ff 00 10 ac 5c f0 4d 54 31 41
>     24 18 01 03 80 3e 22 78 ea 0a a5 a2 57 4f a2 28
>     0f 50 54 a5 4b 00 71 4f 81 00 81 80 a9 40 b3 00
>     d1 c7 ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>     ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>     ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>     ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>     ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>
>    [drm:drm_edid_block_valid [drm]] *ERROR* EDID checksum is invalid,
> remainder is 212
>    Raw EDID:
>     00 ff ff ff ff ff ff 00 10 ac 5c f0 4d 54 31 41
>     24 18 01 03 80 3e 22 78 ea 0a a5 a2 57 4f a2 28
>     0f 50 54 a5 4b 00 71 4f 81 00 81 80 a9 40 ff ff
>     ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>     ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>     ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>     ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>     ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>
> it looks like the beginning is the same, but then it just turns to all
> ones at a random point (even *within* a byte).
>
> Does anything spring to mind?
>
>                      Linus
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> dri-devel mailing list
> dri-devel@lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/dri-devel



-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch
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Re: "EDID checksum is invalid"

[Linus Torvalds]

[-- Attachment #1: Type: text/plain, Size: 703 bytes --]

On Tue, Jan 6, 2015 at 11:32 PM, Daniel Vetter <daniel@ffwll.ch> wrote:
>
> Yeah if the edid probe fails userspace will get a hotplug and
> autodisable the output. With a failsafe X session (just a dumb
> terminal) we can avoid that to check that dpms on itself would work or
> whether the edid probe fail here is just indicative of more trouble.
> Also please boot with drm.debug=0xe, repro and grab dmesg, that might
> shed some more light on what's failing.

Here is an annotated attachment with the dpms off output witj drm.debug=0xe.

It turns out the real failure case doesn't seem to be when the bad
EDID happens. See my notes interspersed with the dmesg output.

                          Linus

[-- Attachment #2: dpms-failure --]
[-- Type: application/octet-stream, Size: 79407 bytes --]

#
# First, two successful "dpms force off" and coming back:
#

DPSM off:
[   66.952520] [drm:hsw_audio_codec_disable] Disable audio codec on pipe A
[   66.970433] [drm:intel_update_fbc] no output, disabling
[   66.970437] [drm:intel_disable_shared_dpll] disable WRPLL 1 (active 1, on? 1) for crtc 9
[   66.970438] [drm:intel_disable_shared_dpll] disabling WRPLL 1
[   66.970440] [drm:intel_display_power_put] disabling always-on
[   66.970443] [drm:check_encoder_state] [ENCODER:20:DAC-20]
[   66.970445] [drm:check_encoder_state] [ENCODER:21:TMDS-21]
[   66.970446] [drm:check_encoder_state] [ENCODER:26:TMDS-26]
[   66.970447] [drm:check_encoder_state] [ENCODER:28:DP MST-28]
[   66.970448] [drm:check_encoder_state] [ENCODER:29:DP MST-29]
[   66.970448] [drm:check_encoder_state] [ENCODER:30:DP MST-30]
[   66.970449] [drm:check_encoder_state] [ENCODER:32:TMDS-32]
[   66.970450] [drm:check_crtc_state] [CRTC:9]
[   66.970452] [drm:check_crtc_state] [CRTC:13]
[   66.970453] [drm:check_crtc_state] [CRTC:17]
[   66.970454] [drm:check_shared_dpll_state] WRPLL 1
[   66.970455] [drm:check_shared_dpll_state] WRPLL 2
[   66.970465] [drm:drm_mode_setcrtc] [CRTC:9]
[   66.970467] [drm:intel_crtc_set_config] [CRTC:9] [NOFB]
[   66.970468] [drm:intel_set_config_compute_mode_changes] computed changes for [CRTC:9], mode_changed=1, fb_changed=0
[   66.970469] [drm:intel_modeset_stage_output_state] [CONNECTOR:33:HDMI-A-3] to [NOCRTC]
[   66.970470] [drm:intel_modeset_stage_output_state] encoder changed, full mode switch
[   66.970471] [drm:intel_modeset_stage_output_state] crtc changed, full mode switch
[   66.970472] [drm:intel_modeset_stage_output_state] crtc disabled, full mode switch
[   66.970473] [drm:intel_modeset_affected_pipes] set mode pipe masks: modeset: 0, prepare: 0, disable: 1
[   66.970477] [drm:check_encoder_state] [ENCODER:20:DAC-20]
[   66.970478] [drm:check_encoder_state] [ENCODER:21:TMDS-21]
[   66.970479] [drm:check_encoder_state] [ENCODER:26:TMDS-26]
[   66.970480] [drm:check_encoder_state] [ENCODER:28:DP MST-28]
[   66.970481] [drm:check_encoder_state] [ENCODER:29:DP MST-29]
[   66.970482] [drm:check_encoder_state] [ENCODER:30:DP MST-30]
[   66.970482] [drm:check_encoder_state] [ENCODER:32:TMDS-32]
[   66.970483] [drm:check_crtc_state] [CRTC:9]
[   66.970484] [drm:check_crtc_state] [CRTC:13]
[   66.970485] [drm:check_crtc_state] [CRTC:17]
[   66.970486] [drm:check_shared_dpll_state] WRPLL 1
[   66.970487] [drm:check_shared_dpll_state] WRPLL 2

.. and coming back up again:

[   78.706362] [drm:drm_mode_setcrtc] [CRTC:9]
[   78.706366] [drm:drm_mode_setcrtc] [CONNECTOR:33:HDMI-A-3]
[   78.706368] [drm:intel_crtc_set_config] [CRTC:9] [FB:59] #connectors=1 (x y) (0 0)
[   78.706370] [drm:intel_set_config_compute_mode_changes] inactive crtc, full mode set
[   78.706371] [drm:intel_set_config_compute_mode_changes] computed changes for [CRTC:9], mode_changed=1, fb_changed=0
[   78.706373] [drm:intel_modeset_stage_output_state] encoder changed, full mode switch
[   78.706374] [drm:intel_modeset_stage_output_state] [CONNECTOR:33:HDMI-A-3] to [CRTC:9]
[   78.706375] [drm:intel_modeset_stage_output_state] crtc changed, full mode switch
[   78.706376] [drm:intel_modeset_stage_output_state] crtc enabled, full mode switch
[   78.706377] [drm:intel_modeset_affected_pipes] set mode pipe masks: modeset: 1, prepare: 1, disable: 0
[   78.706379] [drm:connected_sink_compute_bpp] [CONNECTOR:33:HDMI-A-3] checking for sink bpp constrains
[   78.706383] [drm:intel_hdmi_compute_config] picking bpc to 8 for HDMI output
[   78.706384] [drm:intel_hdmi_compute_config] forcing pipe bpc to 24 for HDMI
[   78.706385] [drm:intel_modeset_pipe_config] plane bpp: 24, pipe bpp: 24, dithering: 0
[   78.706386] [drm:intel_dump_pipe_config] [CRTC:9][modeset] config for pipe A
[   78.706387] [drm:intel_dump_pipe_config] cpu_transcoder: A
[   78.706388] [drm:intel_dump_pipe_config] pipe bpp: 24, dithering: 0
[   78.706389] [drm:intel_dump_pipe_config] fdi/pch: 0, lanes: 0, gmch_m: 0, gmch_n: 0, link_m: 0, link_n: 0, tu: 0
[   78.706390] [drm:intel_dump_pipe_config] dp: 0, gmch_m: 0, gmch_n: 0, link_m: 0, link_n: 0, tu: 0
[   78.706391] [drm:intel_dump_pipe_config] dp: 0, gmch_m2: 0, gmch_n2: 0, link_m2: 0, link_n2: 0, tu2: 0
[   78.706391] [drm:intel_dump_pipe_config] audio: 1, infoframes: 1
[   78.706392] [drm:intel_dump_pipe_config] requested mode:
[   78.706394] [drm:drm_mode_debug_printmodeline] Modeline 0:"3840x2160" 0 297000 3840 4016 4104 4400 2160 2168 2178 2250 0x0 0x5
[   78.706395] [drm:intel_dump_pipe_config] adjusted mode:
[   78.706396] [drm:drm_mode_debug_printmodeline] Modeline 0:"3840x2160" 0 297000 3840 4016 4104 4400 2160 2168 2178 2250 0x0 0x5
[   78.706398] [drm:intel_dump_crtc_timings] crtc timings: 297000 3840 4016 4104 4400 2160 2168 2178 2250, type: 0x0 flags: 0x5
[   78.706398] [drm:intel_dump_pipe_config] port clock: 297000
[   78.706399] [drm:intel_dump_pipe_config] pipe src size: 3840x2160
[   78.706400] [drm:intel_dump_pipe_config] gmch pfit: control: 0x00000000, ratios: 0x00000000, lvds border: 0x00000000
[   78.706401] [drm:intel_dump_pipe_config] pch pfit: pos: 0x00000000, size: 0x00000000, disabled
[   78.706402] [drm:intel_dump_pipe_config] ips: 0
[   78.706403] [drm:intel_dump_pipe_config] double wide: 0
[   78.707115] [drm:intel_get_shared_dpll] CRTC:9 allocated WRPLL 1
[   78.707116] [drm:intel_get_shared_dpll] using WRPLL 1 for pipe A
[   78.707119] [drm:intel_display_power_get] enabling always-on
[   78.707347] [drm:intel_enable_shared_dpll] enable WRPLL 1 (active 0, on? 0) for crtc 9
[   78.707348] [drm:intel_enable_shared_dpll] enabling WRPLL 1
[   78.707460] [drm:intel_audio_codec_enable] ELD on [CONNECTOR:33:HDMI-A-3], [ENCODER:32:TMDS-32]
[   78.707461] [drm:hsw_audio_codec_enable] Enable audio codec on pipe A, 36 bytes ELD
[   78.707465] [drm:audio_config_hdmi_pixel_clock] HDMI audio pixel clock setting for 297000 not found, falling back to defaults
[   78.707466] [drm:audio_config_hdmi_pixel_clock] Configuring HDMI audio for pixel clock 25200 (0x00010000)
[   78.707470] [drm:ironlake_update_primary_plane] Writing base 04A3F000 00000000 0 0 15360
[   78.707472] [drm:intel_update_fbc] disabled per chip default
[   78.707475] [drm:intel_connector_check_state] [CONNECTOR:33:HDMI-A-3]
[   78.707476] [drm:check_encoder_state] [ENCODER:20:DAC-20]
[   78.707477] [drm:check_encoder_state] [ENCODER:21:TMDS-21]
[   78.707478] [drm:check_encoder_state] [ENCODER:26:TMDS-26]
[   78.707479] [drm:check_encoder_state] [ENCODER:28:DP MST-28]
[   78.707479] [drm:check_encoder_state] [ENCODER:29:DP MST-29]
[   78.707480] [drm:check_encoder_state] [ENCODER:30:DP MST-30]
[   78.707480] [drm:check_encoder_state] [ENCODER:32:TMDS-32]
[   78.707485] [drm:check_crtc_state] [CRTC:9]
[   78.707503] [drm:check_crtc_state] [CRTC:13]
[   78.707505] [drm:check_crtc_state] [CRTC:17]
[   78.707508] [drm:check_shared_dpll_state] WRPLL 1
[   78.707510] [drm:check_shared_dpll_state] WRPLL 2
[   85.799637] [drm:add_framebuffer_internal] [FB:81]


# Second successful one (slightly longer wait, not long enough for the monitor to go into deep sleep):

xset dpms force off:
[  124.515144] [drm:intel_crtc_cursor_set_obj] cursor off
[  127.503747] [drm:hsw_audio_codec_disable] Disable audio codec on pipe A
[  127.528958] [drm:intel_update_fbc] no output, disabling
[  127.528961] [drm:intel_disable_shared_dpll] disable WRPLL 1 (active 1, on? 1) for crtc 9
[  127.528963] [drm:intel_disable_shared_dpll] disabling WRPLL 1
[  127.528965] [drm:intel_display_power_put] disabling always-on
[  127.528968] [drm:check_encoder_state] [ENCODER:20:DAC-20]
[  127.528969] [drm:check_encoder_state] [ENCODER:21:TMDS-21]
[  127.528970] [drm:check_encoder_state] [ENCODER:26:TMDS-26]
[  127.528971] [drm:check_encoder_state] [ENCODER:28:DP MST-28]
[  127.528972] [drm:check_encoder_state] [ENCODER:29:DP MST-29]
[  127.528973] [drm:check_encoder_state] [ENCODER:30:DP MST-30]
[  127.528974] [drm:check_encoder_state] [ENCODER:32:TMDS-32]
[  127.528975] [drm:check_crtc_state] [CRTC:9]
[  127.528976] [drm:check_crtc_state] [CRTC:13]
[  127.528977] [drm:check_crtc_state] [CRTC:17]
[  127.528979] [drm:check_shared_dpll_state] WRPLL 1
[  127.528980] [drm:check_shared_dpll_state] WRPLL 2
[  127.528987] [drm:drm_mode_setcrtc] [CRTC:9]
[  127.528988] [drm:intel_crtc_set_config] [CRTC:9] [NOFB]
[  127.528990] [drm:intel_set_config_compute_mode_changes] computed changes for [CRTC:9], mode_changed=1, fb_changed=0
[  127.528991] [drm:intel_modeset_stage_output_state] [CONNECTOR:33:HDMI-A-3] to [NOCRTC]
[  127.528992] [drm:intel_modeset_stage_output_state] encoder changed, full mode switch
[  127.528993] [drm:intel_modeset_stage_output_state] crtc changed, full mode switch
[  127.528994] [drm:intel_modeset_stage_output_state] crtc disabled, full mode switch
[  127.528995] [drm:intel_modeset_affected_pipes] set mode pipe masks: modeset: 0, prepare: 0, disable: 1
[  127.528999] [drm:check_encoder_state] [ENCODER:20:DAC-20]
[  127.529000] [drm:check_encoder_state] [ENCODER:21:TMDS-21]
[  127.529001] [drm:check_encoder_state] [ENCODER:26:TMDS-26]
[  127.529002] [drm:check_encoder_state] [ENCODER:28:DP MST-28]
[  127.529002] [drm:check_encoder_state] [ENCODER:29:DP MST-29]
[  127.529003] [drm:check_encoder_state] [ENCODER:30:DP MST-30]
[  127.529004] [drm:check_encoder_state] [ENCODER:32:TMDS-32]
[  127.529005] [drm:check_crtc_state] [CRTC:9]
[  127.529006] [drm:check_crtc_state] [CRTC:13]
[  127.529007] [drm:check_crtc_state] [CRTC:17]
[  127.529008] [drm:check_shared_dpll_state] WRPLL 1
[  127.529009] [drm:check_shared_dpll_state] WRPLL 2

.. and back again
[  321.934278] [drm:drm_mode_setcrtc] [CRTC:9]
[  321.934282] [drm:drm_mode_setcrtc] [CONNECTOR:33:HDMI-A-3]
[  321.934284] [drm:intel_crtc_set_config] [CRTC:9] [FB:59] #connectors=1 (x y) (0 0)
[  321.934286] [drm:intel_set_config_compute_mode_changes] inactive crtc, full mode set
[  321.934287] [drm:intel_set_config_compute_mode_changes] computed changes for [CRTC:9], mode_changed=1, fb_changed=0
[  321.934288] [drm:intel_modeset_stage_output_state] encoder changed, full mode switch
[  321.934289] [drm:intel_modeset_stage_output_state] [CONNECTOR:33:HDMI-A-3] to [CRTC:9]
[  321.934290] [drm:intel_modeset_stage_output_state] crtc changed, full mode switch
[  321.934291] [drm:intel_modeset_stage_output_state] crtc enabled, full mode switch
[  321.934293] [drm:intel_modeset_affected_pipes] set mode pipe masks: modeset: 1, prepare: 1, disable: 0
[  321.934294] [drm:connected_sink_compute_bpp] [CONNECTOR:33:HDMI-A-3] checking for sink bpp constrains
[  321.934298] [drm:intel_hdmi_compute_config] picking bpc to 8 for HDMI output
[  321.934299] [drm:intel_hdmi_compute_config] forcing pipe bpc to 24 for HDMI
[  321.934300] [drm:intel_modeset_pipe_config] plane bpp: 24, pipe bpp: 24, dithering: 0
[  321.934301] [drm:intel_dump_pipe_config] [CRTC:9][modeset] config for pipe A
[  321.934302] [drm:intel_dump_pipe_config] cpu_transcoder: A
[  321.934303] [drm:intel_dump_pipe_config] pipe bpp: 24, dithering: 0
[  321.934304] [drm:intel_dump_pipe_config] fdi/pch: 0, lanes: 0, gmch_m: 0, gmch_n: 0, link_m: 0, link_n: 0, tu: 0
[  321.934305] [drm:intel_dump_pipe_config] dp: 0, gmch_m: 0, gmch_n: 0, link_m: 0, link_n: 0, tu: 0
[  321.934306] [drm:intel_dump_pipe_config] dp: 0, gmch_m2: 0, gmch_n2: 0, link_m2: 0, link_n2: 0, tu2: 0
[  321.934307] [drm:intel_dump_pipe_config] audio: 1, infoframes: 1
[  321.934308] [drm:intel_dump_pipe_config] requested mode:
[  321.934310] [drm:drm_mode_debug_printmodeline] Modeline 0:"3840x2160" 0 297000 3840 4016 4104 4400 2160 2168 2178 2250 0x0 0x5
[  321.934310] [drm:intel_dump_pipe_config] adjusted mode:
[  321.934312] [drm:drm_mode_debug_printmodeline] Modeline 0:"3840x2160" 0 297000 3840 4016 4104 4400 2160 2168 2178 2250 0x0 0x5
[  321.934313] [drm:intel_dump_crtc_timings] crtc timings: 297000 3840 4016 4104 4400 2160 2168 2178 2250, type: 0x0 flags: 0x5
[  321.934314] [drm:intel_dump_pipe_config] port clock: 297000
[  321.934315] [drm:intel_dump_pipe_config] pipe src size: 3840x2160
[  321.934316] [drm:intel_dump_pipe_config] gmch pfit: control: 0x00000000, ratios: 0x00000000, lvds border: 0x00000000
[  321.934317] [drm:intel_dump_pipe_config] pch pfit: pos: 0x00000000, size: 0x00000000, disabled
[  321.934318] [drm:intel_dump_pipe_config] ips: 0
[  321.934319] [drm:intel_dump_pipe_config] double wide: 0
[  321.935069] [drm:intel_get_shared_dpll] CRTC:9 allocated WRPLL 1
[  321.935070] [drm:intel_get_shared_dpll] using WRPLL 1 for pipe A
[  321.935088] [drm:intel_display_power_get] enabling always-on
[  321.935092] [drm:intel_enable_shared_dpll] enable WRPLL 1 (active 0, on? 0) for crtc 9
[  321.935093] [drm:intel_enable_shared_dpll] enabling WRPLL 1
[  321.935199] [drm:intel_audio_codec_enable] ELD on [CONNECTOR:33:HDMI-A-3], [ENCODER:32:TMDS-32]
[  321.935200] [drm:hsw_audio_codec_enable] Enable audio codec on pipe A, 36 bytes ELD
[  321.935205] [drm:audio_config_hdmi_pixel_clock] HDMI audio pixel clock setting for 297000 not found, falling back to defaults
[  321.935206] [drm:audio_config_hdmi_pixel_clock] Configuring HDMI audio for pixel clock 25200 (0x00010000)
[  321.935211] [drm:ironlake_update_primary_plane] Writing base 04A3F000 00000000 0 0 15360
[  321.935213] [drm:intel_update_fbc] disabled per chip default
[  321.935217] [drm:intel_connector_check_state] [CONNECTOR:33:HDMI-A-3]
[  321.935218] [drm:check_encoder_state] [ENCODER:20:DAC-20]
[  321.935219] [drm:check_encoder_state] [ENCODER:21:TMDS-21]
[  321.935220] [drm:check_encoder_state] [ENCODER:26:TMDS-26]
[  321.935221] [drm:check_encoder_state] [ENCODER:28:DP MST-28]
[  321.935222] [drm:check_encoder_state] [ENCODER:29:DP MST-29]
[  321.935223] [drm:check_encoder_state] [ENCODER:30:DP MST-30]
[  321.935223] [drm:check_encoder_state] [ENCODER:32:TMDS-32]
[  321.935225] [drm:check_crtc_state] [CRTC:9]
[  321.935230] [drm:check_crtc_state] [CRTC:13]
[  321.935232] [drm:check_crtc_state] [CRTC:17]
[  321.935233] [drm:check_shared_dpll_state] WRPLL 1
[  321.935234] [drm:check_shared_dpll_state] WRPLL 2
[  332.459963] [drm:add_framebuffer_internal] [FB:82]


#
# And here comes the failure case:
#   longer wait still, until display goes into power off state):
#

DPMS off:
[  395.284653] [drm:hsw_audio_codec_disable] Disable audio codec on pipe A
[  395.286628] [drm:intel_update_fbc] no output, disabling
[  395.286631] [drm:intel_disable_shared_dpll] disable WRPLL 1 (active 1, on? 1) for crtc 9
[  395.286632] [drm:intel_disable_shared_dpll] disabling WRPLL 1
[  395.286634] [drm:intel_display_power_put] disabling always-on
[  395.286637] [drm:check_encoder_state] [ENCODER:20:DAC-20]
[  395.286639] [drm:check_encoder_state] [ENCODER:21:TMDS-21]
[  395.286639] [drm:check_encoder_state] [ENCODER:26:TMDS-26]
[  395.286640] [drm:check_encoder_state] [ENCODER:28:DP MST-28]
[  395.286641] [drm:check_encoder_state] [ENCODER:29:DP MST-29]
[  395.286642] [drm:check_encoder_state] [ENCODER:30:DP MST-30]
[  395.286643] [drm:check_encoder_state] [ENCODER:32:TMDS-32]
[  395.286644] [drm:check_crtc_state] [CRTC:9]
[  395.286646] [drm:check_crtc_state] [CRTC:13]
[  395.286647] [drm:check_crtc_state] [CRTC:17]
[  395.286648] [drm:check_shared_dpll_state] WRPLL 1
[  395.286649] [drm:check_shared_dpll_state] WRPLL 2
[  395.286654] [drm:drm_mode_setcrtc] [CRTC:9]
[  395.286655] [drm:intel_crtc_set_config] [CRTC:9] [NOFB]
[  395.286656] [drm:intel_set_config_compute_mode_changes] computed changes for [CRTC:9], mode_changed=1, fb_changed=0
[  395.286658] [drm:intel_modeset_stage_output_state] [CONNECTOR:33:HDMI-A-3] to [NOCRTC]
[  395.286658] [drm:intel_modeset_stage_output_state] encoder changed, full mode switch
[  395.286659] [drm:intel_modeset_stage_output_state] crtc changed, full mode switch
[  395.286660] [drm:intel_modeset_stage_output_state] crtc disabled, full mode switch
[  395.286661] [drm:intel_modeset_affected_pipes] set mode pipe masks: modeset: 0, prepare: 0, disable: 1
[  395.286665] [drm:check_encoder_state] [ENCODER:20:DAC-20]
[  395.286666] [drm:check_encoder_state] [ENCODER:21:TMDS-21]
[  395.286667] [drm:check_encoder_state] [ENCODER:26:TMDS-26]
[  395.286668] [drm:check_encoder_state] [ENCODER:28:DP MST-28]
[  395.286669] [drm:check_encoder_state] [ENCODER:29:DP MST-29]
[  395.286669] [drm:check_encoder_state] [ENCODER:30:DP MST-30]
[  395.286670] [drm:check_encoder_state] [ENCODER:32:TMDS-32]
[  395.286671] [drm:check_crtc_state] [CRTC:9]
[  395.286672] [drm:check_crtc_state] [CRTC:13]
[  395.286673] [drm:check_crtc_state] [CRTC:17]
[  395.286674] [drm:check_shared_dpll_state] WRPLL 1
[  395.286675] [drm:check_shared_dpll_state] WRPLL 2

.. and then try to turn things on again, but this time it fails.

No EDID failure report this time, though:

[ 1172.201356] [drm:drm_mode_setcrtc] [CRTC:9]
[ 1172.201367] [drm:drm_mode_setcrtc] [CONNECTOR:33:HDMI-A-3]
[ 1172.201371] [drm:intel_crtc_set_config] [CRTC:9] [FB:59] #connectors=1 (x y) (0 0)
[ 1172.201376] [drm:intel_set_config_compute_mode_changes] inactive crtc, full mode set
[ 1172.201380] [drm:intel_set_config_compute_mode_changes] computed changes for [CRTC:9], mode_changed=1, fb_changed=0
[ 1172.201383] [drm:intel_modeset_stage_output_state] encoder changed, full mode switch
[ 1172.201386] [drm:intel_modeset_stage_output_state] [CONNECTOR:33:HDMI-A-3] to [CRTC:9]
[ 1172.201389] [drm:intel_modeset_stage_output_state] crtc changed, full mode switch
[ 1172.201392] [drm:intel_modeset_stage_output_state] crtc enabled, full mode switch
[ 1172.201396] [drm:intel_modeset_affected_pipes] set mode pipe masks: modeset: 1, prepare: 1, disable: 0
[ 1172.201400] [drm:connected_sink_compute_bpp] [CONNECTOR:33:HDMI-A-3] checking for sink bpp constrains
[ 1172.201411] [drm:intel_hdmi_compute_config] picking bpc to 8 for HDMI output
[ 1172.201413] [drm:intel_hdmi_compute_config] forcing pipe bpc to 24 for HDMI
[ 1172.201416] [drm:intel_modeset_pipe_config] plane bpp: 24, pipe bpp: 24, dithering: 0
[ 1172.201419] [drm:intel_dump_pipe_config] [CRTC:9][modeset] config for pipe A
[ 1172.201422] [drm:intel_dump_pipe_config] cpu_transcoder: A
[ 1172.201424] [drm:intel_dump_pipe_config] pipe bpp: 24, dithering: 0
[ 1172.201428] [drm:intel_dump_pipe_config] fdi/pch: 0, lanes: 0, gmch_m: 0, gmch_n: 0, link_m: 0, link_n: 0, tu: 0
[ 1172.201431] [drm:intel_dump_pipe_config] dp: 0, gmch_m: 0, gmch_n: 0, link_m: 0, link_n: 0, tu: 0
[ 1172.201434] [drm:intel_dump_pipe_config] dp: 0, gmch_m2: 0, gmch_n2: 0, link_m2: 0, link_n2: 0, tu2: 0
[ 1172.201436] [drm:intel_dump_pipe_config] audio: 1, infoframes: 1
[ 1172.201439] [drm:intel_dump_pipe_config] requested mode:
[ 1172.201444] [drm:drm_mode_debug_printmodeline] Modeline 0:"3840x2160" 0 297000 3840 4016 4104 4400 2160 2168 2178 2250 0x0 0x5
[ 1172.201446] [drm:intel_dump_pipe_config] adjusted mode:
[ 1172.201450] [drm:drm_mode_debug_printmodeline] Modeline 0:"3840x2160" 0 297000 3840 4016 4104 4400 2160 2168 2178 2250 0x0 0x5
[ 1172.201455] [drm:intel_dump_crtc_timings] crtc timings: 297000 3840 4016 4104 4400 2160 2168 2178 2250, type: 0x0 flags: 0x5
[ 1172.201457] [drm:intel_dump_pipe_config] port clock: 297000
[ 1172.201459] [drm:intel_dump_pipe_config] pipe src size: 3840x2160
[ 1172.201462] [drm:intel_dump_pipe_config] gmch pfit: control: 0x00000000, ratios: 0x00000000, lvds border: 0x00000000
[ 1172.201465] [drm:intel_dump_pipe_config] pch pfit: pos: 0x00000000, size: 0x00000000, disabled
[ 1172.201467] [drm:intel_dump_pipe_config] ips: 0
[ 1172.201470] [drm:intel_dump_pipe_config] double wide: 0
[ 1172.203671] [drm:intel_get_shared_dpll] CRTC:9 allocated WRPLL 1
[ 1172.203675] [drm:intel_get_shared_dpll] using WRPLL 1 for pipe A
[ 1172.203682] [drm:intel_display_power_get] enabling always-on
[ 1172.203692] [drm:intel_enable_shared_dpll] enable WRPLL 1 (active 0, on? 0) for crtc 9
[ 1172.203694] [drm:intel_enable_shared_dpll] enabling WRPLL 1
[ 1172.203898] [drm:intel_audio_codec_enable] ELD on [CONNECTOR:33:HDMI-A-3], [ENCODER:32:TMDS-32]
[ 1172.203902] [drm:hsw_audio_codec_enable] Enable audio codec on pipe A, 36 bytes ELD
[ 1172.203914] [drm:audio_config_hdmi_pixel_clock] HDMI audio pixel clock setting for 297000 not found, falling back to defaults
[ 1172.203918] [drm:audio_config_hdmi_pixel_clock] Configuring HDMI audio for pixel clock 25200 (0x00010000)
[ 1172.203932] [drm:ironlake_update_primary_plane] Writing base 04A3F000 00000000 0 0 15360
[ 1172.203940] [drm:intel_update_fbc] disabled per chip default
[ 1172.203951] [drm:intel_connector_check_state] [CONNECTOR:33:HDMI-A-3]
[ 1172.203957] [drm:check_encoder_state] [ENCODER:20:DAC-20]
[ 1172.203963] [drm:check_encoder_state] [ENCODER:21:TMDS-21]
[ 1172.203967] [drm:check_encoder_state] [ENCODER:26:TMDS-26]
[ 1172.203971] [drm:check_encoder_state] [ENCODER:28:DP MST-28]
[ 1172.203975] [drm:check_encoder_state] [ENCODER:29:DP MST-29]
[ 1172.203979] [drm:check_encoder_state] [ENCODER:30:DP MST-30]
[ 1172.203982] [drm:check_encoder_state] [ENCODER:32:TMDS-32]
[ 1172.203987] [drm:check_crtc_state] [CRTC:9]
[ 1172.204003] [drm:check_crtc_state] [CRTC:13]
[ 1172.204008] [drm:check_crtc_state] [CRTC:17]
[ 1172.204012] [drm:check_shared_dpll_state] WRPLL 1
[ 1172.204017] [drm:check_shared_dpll_state] WRPLL 2
[ 1172.205341] [drm:add_framebuffer_internal] [FB:83]
[ 1172.303981] [drm:intel_update_fbc] no output, disabling
[ 1172.303982] [drm:hsw_audio_codec_disable] Disable audio codec on pipe A
[ 1172.337282] [drm:intel_disable_shared_dpll] disable WRPLL 1 (active 1, on? 1) for crtc 9
[ 1172.337284] [drm:intel_disable_shared_dpll] disabling WRPLL 1
[ 1172.337287] [drm:intel_display_power_put] disabling always-on
[ 1172.337290] [drm:check_encoder_state] [ENCODER:20:DAC-20]
[ 1172.337292] [drm:check_encoder_state] [ENCODER:21:TMDS-21]
[ 1172.337293] [drm:check_encoder_state] [ENCODER:26:TMDS-26]
[ 1172.337293] [drm:check_encoder_state] [ENCODER:28:DP MST-28]
[ 1172.337294] [drm:check_encoder_state] [ENCODER:29:DP MST-29]
[ 1172.337295] [drm:check_encoder_state] [ENCODER:30:DP MST-30]
[ 1172.337296] [drm:check_encoder_state] [ENCODER:32:TMDS-32]
[ 1172.337297] [drm:check_crtc_state] [CRTC:9]
[ 1172.337299] [drm:check_crtc_state] [CRTC:13]
[ 1172.337300] [drm:check_crtc_state] [CRTC:17]
[ 1172.337301] [drm:check_shared_dpll_state] WRPLL 1
[ 1172.337302] [drm:check_shared_dpll_state] WRPLL 2
[ 1172.337332] [drm:drm_mode_setcrtc] [CRTC:9]
[ 1172.337333] [drm:intel_crtc_set_config] [CRTC:9] [NOFB]
[ 1172.337335] [drm:intel_set_config_compute_mode_changes] computed changes for [CRTC:9], mode_changed=1, fb_changed=0
[ 1172.337336] [drm:intel_modeset_stage_output_state] [CONNECTOR:33:HDMI-A-3] to [NOCRTC]
[ 1172.337337] [drm:intel_modeset_stage_output_state] encoder changed, full mode switch
[ 1172.337338] [drm:intel_modeset_stage_output_state] crtc changed, full mode switch
[ 1172.337339] [drm:intel_modeset_stage_output_state] crtc disabled, full mode switch
[ 1172.337340] [drm:intel_modeset_affected_pipes] set mode pipe masks: modeset: 0, prepare: 0, disable: 1
[ 1172.337344] [drm:check_encoder_state] [ENCODER:20:DAC-20]
[ 1172.337345] [drm:check_encoder_state] [ENCODER:21:TMDS-21]
[ 1172.337346] [drm:check_encoder_state] [ENCODER:26:TMDS-26]
[ 1172.337347] [drm:check_encoder_state] [ENCODER:28:DP MST-28]
[ 1172.337348] [drm:check_encoder_state] [ENCODER:29:DP MST-29]
[ 1172.337348] [drm:check_encoder_state] [ENCODER:30:DP MST-30]
[ 1172.337349] [drm:check_encoder_state] [ENCODER:32:TMDS-32]
[ 1172.337350] [drm:check_crtc_state] [CRTC:9]
[ 1172.337351] [drm:check_crtc_state] [CRTC:13]
[ 1172.337352] [drm:check_crtc_state] [CRTC:17]
[ 1172.337353] [drm:check_shared_dpll_state] WRPLL 1
[ 1172.337354] [drm:check_shared_dpll_state] WRPLL 2
[ 1172.337357] [drm:intel_crtc_cursor_set_obj] cursor off
[ 1172.337381] [drm:drm_mode_setcrtc] [CRTC:9]
[ 1172.337384] [drm:drm_mode_setcrtc] [CONNECTOR:33:HDMI-A-3]
[ 1172.337385] [drm:intel_crtc_set_config] [CRTC:9] [FB:59] #connectors=1 (x y) (0 0)
[ 1172.337386] [drm:intel_set_config_compute_mode_changes] inactive crtc, full mode set
[ 1172.337387] [drm:intel_set_config_compute_mode_changes] computed changes for [CRTC:9], mode_changed=1, fb_changed=0
[ 1172.337388] [drm:intel_modeset_stage_output_state] encoder changed, full mode switch
[ 1172.337389] [drm:intel_modeset_stage_output_state] [CONNECTOR:33:HDMI-A-3] to [CRTC:9]
[ 1172.337390] [drm:intel_modeset_stage_output_state] crtc changed, full mode switch
[ 1172.337390] [drm:intel_modeset_stage_output_state] crtc enabled, full mode switch
[ 1172.337392] [drm:intel_modeset_affected_pipes] set mode pipe masks: modeset: 1, prepare: 1, disable: 0
[ 1172.337393] [drm:connected_sink_compute_bpp] [CONNECTOR:33:HDMI-A-3] checking for sink bpp constrains
[ 1172.337396] [drm:intel_hdmi_compute_config] picking bpc to 8 for HDMI output
[ 1172.337397] [drm:intel_hdmi_compute_config] forcing pipe bpc to 24 for HDMI
[ 1172.337399] [drm:intel_modeset_pipe_config] plane bpp: 24, pipe bpp: 24, dithering: 0
[ 1172.337400] [drm:intel_dump_pipe_config] [CRTC:9][modeset] config for pipe A
[ 1172.337401] [drm:intel_dump_pipe_config] cpu_transcoder: A
[ 1172.337401] [drm:intel_dump_pipe_config] pipe bpp: 24, dithering: 0
[ 1172.337402] [drm:intel_dump_pipe_config] fdi/pch: 0, lanes: 0, gmch_m: 0, gmch_n: 0, link_m: 0, link_n: 0, tu: 0
[ 1172.337403] [drm:intel_dump_pipe_config] dp: 0, gmch_m: 0, gmch_n: 0, link_m: 0, link_n: 0, tu: 0
[ 1172.337405] [drm:intel_dump_pipe_config] dp: 0, gmch_m2: 0, gmch_n2: 0, link_m2: 0, link_n2: 0, tu2: 0
[ 1172.337405] [drm:intel_dump_pipe_config] audio: 1, infoframes: 1
[ 1172.337406] [drm:intel_dump_pipe_config] requested mode:
[ 1172.337408] [drm:drm_mode_debug_printmodeline] Modeline 0:"3840x2160" 0 297000 3840 4016 4104 4400 2160 2168 2178 2250 0x0 0x5
[ 1172.337409] [drm:intel_dump_pipe_config] adjusted mode:
[ 1172.337410] [drm:drm_mode_debug_printmodeline] Modeline 0:"3840x2160" 0 297000 3840 4016 4104 4400 2160 2168 2178 2250 0x0 0x5
[ 1172.337411] [drm:intel_dump_crtc_timings] crtc timings: 297000 3840 4016 4104 4400 2160 2168 2178 2250, type: 0x0 flags: 0x5
[ 1172.337412] [drm:intel_dump_pipe_config] port clock: 297000
[ 1172.337413] [drm:intel_dump_pipe_config] pipe src size: 3840x2160
[ 1172.337414] [drm:intel_dump_pipe_config] gmch pfit: control: 0x00000000, ratios: 0x00000000, lvds border: 0x00000000
[ 1172.337415] [drm:intel_dump_pipe_config] pch pfit: pos: 0x00000000, size: 0x00000000, disabled
[ 1172.337416] [drm:intel_dump_pipe_config] ips: 0
[ 1172.337416] [drm:intel_dump_pipe_config] double wide: 0
[ 1172.338127] [drm:intel_get_shared_dpll] CRTC:9 allocated WRPLL 1
[ 1172.338128] [drm:intel_get_shared_dpll] using WRPLL 1 for pipe A
[ 1172.338130] [drm:intel_display_power_get] enabling always-on
[ 1172.338133] [drm:intel_enable_shared_dpll] enable WRPLL 1 (active 0, on? 0) for crtc 9
[ 1172.338134] [drm:intel_enable_shared_dpll] enabling WRPLL 1
[ 1172.338243] [drm:intel_audio_codec_enable] ELD on [CONNECTOR:33:HDMI-A-3], [ENCODER:32:TMDS-32]
[ 1172.338246] [drm:hsw_audio_codec_enable] Enable audio codec on pipe A, 36 bytes ELD
[ 1172.338251] [drm:audio_config_hdmi_pixel_clock] HDMI audio pixel clock setting for 297000 not found, falling back to defaults
[ 1172.338252] [drm:audio_config_hdmi_pixel_clock] Configuring HDMI audio for pixel clock 25200 (0x00010000)
[ 1172.338255] [drm:ironlake_update_primary_plane] Writing base 04A3F000 00000000 0 0 15360
[ 1172.338257] [drm:intel_update_fbc] disabled per chip default
[ 1172.338260] [drm:intel_connector_check_state] [CONNECTOR:33:HDMI-A-3]
[ 1172.338261] [drm:check_encoder_state] [ENCODER:20:DAC-20]
[ 1172.338262] [drm:check_encoder_state] [ENCODER:21:TMDS-21]
[ 1172.338263] [drm:check_encoder_state] [ENCODER:26:TMDS-26]
[ 1172.338264] [drm:check_encoder_state] [ENCODER:28:DP MST-28]
[ 1172.338264] [drm:check_encoder_state] [ENCODER:29:DP MST-29]
[ 1172.338265] [drm:check_encoder_state] [ENCODER:30:DP MST-30]
[ 1172.338266] [drm:check_encoder_state] [ENCODER:32:TMDS-32]
[ 1172.338267] [drm:check_crtc_state] [CRTC:9]
[ 1172.338272] [drm:check_crtc_state] [CRTC:13]
[ 1172.338273] [drm:check_crtc_state] [CRTC:17]
[ 1172.338274] [drm:check_shared_dpll_state] WRPLL 1
[ 1172.338275] [drm:check_shared_dpll_state] WRPLL 2
[ 1172.338286] [drm:add_framebuffer_internal] [FB:84]

Screen is still black at this point.

Here I turn the monitor off and on again to get it to come alive. Funnily, *this* is when the EDID failure happens.

[ 1195.828326] [drm:intel_hpd_irq_handler] hotplug event received, stat 0x00800000, dig 0x00121010
[ 1195.828330] [drm:intel_hpd_irq_handler] Received HPD interrupt on PIN 6 - cnt: 0
[ 1195.828351] [drm:i915_hotplug_work_func] running encoder hotplug functions
[ 1195.828354] [drm:i915_hotplug_work_func] Connector HDMI-A-3 (pin 6) received hotplug event.
[ 1195.828357] [drm:intel_hdmi_detect] [CONNECTOR:33:HDMI-A-3]
[ 1195.828576] [drm:gmbus_xfer] GMBUS [i915 gmbus dpd] NAK for addr: 0050 r(1)
[ 1195.828578] [drm:drm_do_probe_ddc_edid] drm: skipping non-existent adapter i915 gmbus dpd
[ 1195.828581] [drm:intel_hpd_irq_event] [CONNECTOR:33:HDMI-A-3] status updated from connected to disconnected
[ 1195.841282] [drm:drm_mode_getresources] CRTC[3] CONNECTORS[5] ENCODERS[7]
[ 1195.841316] [drm:drm_mode_getconnector] [CONNECTOR:27:?]
[ 1195.841320] [drm:drm_helper_probe_single_connector_modes_merge_bits] [CONNECTOR:27:DP-1]
[ 1195.841322] [drm:intel_dp_detect] [CONNECTOR:27:DP-1]
[ 1195.841334] [drm:drm_helper_probe_single_connector_modes_merge_bits] [CONNECTOR:27:DP-1] disconnected
[ 1195.841341] [drm:drm_mode_getconnector] [CONNECTOR:22:?]
[ 1195.841344] [drm:drm_helper_probe_single_connector_modes_merge_bits] [CONNECTOR:22:HDMI-A-1]
[ 1195.841346] [drm:intel_hdmi_detect] [CONNECTOR:22:HDMI-A-1]
[ 1195.841565] [drm:gmbus_xfer] GMBUS [i915 gmbus dpb] NAK for addr: 0050 r(1)
[ 1195.841571] [drm:drm_do_probe_ddc_edid] drm: skipping non-existent adapter i915 gmbus dpb
[ 1195.841575] [drm:drm_helper_probe_single_connector_modes_merge_bits] [CONNECTOR:22:HDMI-A-1] disconnected
[ 1195.841588] [drm:drm_mode_getconnector] [CONNECTOR:31:?]
[ 1195.841591] [drm:drm_helper_probe_single_connector_modes_merge_bits] [CONNECTOR:31:HDMI-A-2]
[ 1195.841593] [drm:intel_hdmi_detect] [CONNECTOR:31:HDMI-A-2]
[ 1195.841806] [drm:gmbus_xfer] GMBUS [i915 gmbus dpc] NAK for addr: 0050 r(1)
[ 1195.841812] [drm:drm_do_probe_ddc_edid] drm: skipping non-existent adapter i915 gmbus dpc
[ 1195.841815] [drm:drm_helper_probe_single_connector_modes_merge_bits] [CONNECTOR:31:HDMI-A-2] disconnected
[ 1195.841848] [drm:drm_mode_getconnector] [CONNECTOR:33:?]
[ 1195.841851] [drm:drm_helper_probe_single_connector_modes_merge_bits] [CONNECTOR:33:HDMI-A-3]
[ 1195.841857] [drm:intel_hdmi_detect] [CONNECTOR:33:HDMI-A-3]
[ 1195.842042] [drm:gmbus_xfer] GMBUS [i915 gmbus dpd] NAK for addr: 0050 r(1)
[ 1195.842045] [drm:drm_do_probe_ddc_edid] drm: skipping non-existent adapter i915 gmbus dpd
[ 1195.842047] [drm:drm_helper_probe_single_connector_modes_merge_bits] [CONNECTOR:33:HDMI-A-3] disconnected
[ 1195.842180] [drm:drm_mode_getconnector] [CONNECTOR:19:?]
[ 1195.842185] [drm:drm_helper_probe_single_connector_modes_merge_bits] [CONNECTOR:19:VGA-1]
[ 1195.842190] [drm:intel_crt_detect] [CONNECTOR:19:VGA-1] force=1
[ 1195.842201] [drm:intel_ironlake_crt_detect_hotplug] ironlake hotplug adpa=0xf40000, result 0
[ 1195.842203] [drm:intel_crt_detect] CRT not detected via hotplug
[ 1195.842379] [drm:gmbus_xfer] GMBUS [i915 gmbus dpb] NAK for addr: 0050 r(1)
[ 1195.842383] [drm:drm_do_probe_ddc_edid] drm: skipping non-existent adapter i915 gmbus dpb
[ 1195.842385] [drm:intel_crt_get_edid] CRT GMBUS EDID read failed, retry using GPIO bit-banging
[ 1195.842389] [drm:intel_gmbus_force_bit] enabling bit-banging on i915 gmbus dpb. force bit now 1
[ 1195.842913] [drm:drm_do_probe_ddc_edid] drm: skipping non-existent adapter i915 gmbus dpb
[ 1195.842916] [drm:intel_gmbus_force_bit] disabling bit-banging on i915 gmbus dpb. force bit now 0
[ 1195.842918] [drm:intel_crt_detect_ddc] CRT not detected via DDC:0x50 [no valid EDID found]
[ 1195.842921] [drm:drm_helper_probe_single_connector_modes_merge_bits] [CONNECTOR:19:VGA-1] disconnected
[ 1195.847460] [drm:drm_mode_getconnector] [CONNECTOR:27:?]
[ 1195.847465] [drm:drm_helper_probe_single_connector_modes_merge_bits] [CONNECTOR:27:DP-1]
[ 1195.847468] [drm:intel_dp_detect] [CONNECTOR:27:DP-1]
[ 1195.847478] [drm:drm_helper_probe_single_connector_modes_merge_bits] [CONNECTOR:27:DP-1] disconnected
[ 1195.847484] [drm:drm_mode_getconnector] [CONNECTOR:22:?]
[ 1195.847487] [drm:drm_helper_probe_single_connector_modes_merge_bits] [CONNECTOR:22:HDMI-A-1]
[ 1195.847488] [drm:intel_hdmi_detect] [CONNECTOR:22:HDMI-A-1]
[ 1195.847668] [drm:gmbus_xfer] GMBUS [i915 gmbus dpb] NAK for addr: 0050 r(1)
[ 1195.847670] [drm:drm_do_probe_ddc_edid] drm: skipping non-existent adapter i915 gmbus dpb
[ 1195.847673] [drm:drm_helper_probe_single_connector_modes_merge_bits] [CONNECTOR:22:HDMI-A-1] disconnected
[ 1195.847678] [drm:drm_mode_getconnector] [CONNECTOR:31:?]
[ 1195.847680] [drm:drm_helper_probe_single_connector_modes_merge_bits] [CONNECTOR:31:HDMI-A-2]
[ 1195.847682] [drm:intel_hdmi_detect] [CONNECTOR:31:HDMI-A-2]
[ 1195.847860] [drm:gmbus_xfer] GMBUS [i915 gmbus dpc] NAK for addr: 0050 r(1)
[ 1195.847862] [drm:drm_do_probe_ddc_edid] drm: skipping non-existent adapter i915 gmbus dpc
[ 1195.847864] [drm:drm_helper_probe_single_connector_modes_merge_bits] [CONNECTOR:31:HDMI-A-2] disconnected
[ 1195.847869] [drm:drm_mode_getconnector] [CONNECTOR:33:?]
[ 1195.847871] [drm:drm_helper_probe_single_connector_modes_merge_bits] [CONNECTOR:33:HDMI-A-3]
[ 1195.847873] [drm:intel_hdmi_detect] [CONNECTOR:33:HDMI-A-3]
[ 1195.848044] [drm:gmbus_xfer] GMBUS [i915 gmbus dpd] NAK for addr: 0050 r(1)
[ 1195.848046] [drm:drm_do_probe_ddc_edid] drm: skipping non-existent adapter i915 gmbus dpd
[ 1195.848048] [drm:drm_helper_probe_single_connector_modes_merge_bits] [CONNECTOR:33:HDMI-A-3] disconnected
[ 1195.848053] [drm:drm_mode_getconnector] [CONNECTOR:19:?]
[ 1195.848055] [drm:drm_helper_probe_single_connector_modes_merge_bits] [CONNECTOR:19:VGA-1]
[ 1195.848058] [drm:intel_crt_detect] [CONNECTOR:19:VGA-1] force=1
[ 1195.848066] [drm:intel_ironlake_crt_detect_hotplug] ironlake hotplug adpa=0xf40000, result 0
[ 1195.848068] [drm:intel_crt_detect] CRT not detected via hotplug
[ 1195.848239] [drm:gmbus_xfer] GMBUS [i915 gmbus dpb] NAK for addr: 0050 r(1)
[ 1195.848241] [drm:drm_do_probe_ddc_edid] drm: skipping non-existent adapter i915 gmbus dpb
[ 1195.848243] [drm:intel_crt_get_edid] CRT GMBUS EDID read failed, retry using GPIO bit-banging
[ 1195.848246] [drm:intel_gmbus_force_bit] enabling bit-banging on i915 gmbus dpb. force bit now 1
[ 1195.848823] [drm:drm_do_probe_ddc_edid] drm: skipping non-existent adapter i915 gmbus dpb
[ 1195.848824] [drm:intel_gmbus_force_bit] disabling bit-banging on i915 gmbus dpb. force bit now 0
[ 1195.848826] [drm:intel_crt_detect_ddc] CRT not detected via DDC:0x50 [no valid EDID found]
[ 1195.848828] [drm:drm_helper_probe_single_connector_modes_merge_bits] [CONNECTOR:19:VGA-1] disconnected
[ 1195.863108] [drm:intel_hpd_irq_handler] hotplug event received, stat 0x00800000, dig 0x00121010
[ 1195.863111] [drm:intel_hpd_irq_handler] Received HPD interrupt on PIN 6 - cnt: 1
[ 1195.863128] [drm:i915_hotplug_work_func] running encoder hotplug functions
[ 1195.863130] [drm:i915_hotplug_work_func] Connector HDMI-A-3 (pin 6) received hotplug event.
[ 1195.863132] [drm:intel_hdmi_detect] [CONNECTOR:33:HDMI-A-3]
[ 1195.888040] [drm:drm_detect_monitor_audio] Monitor has basic audio support
[ 1195.888044] [drm:intel_hpd_irq_event] [CONNECTOR:33:HDMI-A-3] status updated from disconnected to connected
[ 1195.888621] [drm:drm_mode_getresources] CRTC[3] CONNECTORS[5] ENCODERS[7]
[ 1195.888633] [drm:drm_mode_getconnector] [CONNECTOR:27:?]
[ 1195.888634] [drm:drm_helper_probe_single_connector_modes_merge_bits] [CONNECTOR:27:DP-1]
[ 1195.888636] [drm:intel_dp_detect] [CONNECTOR:27:DP-1]
[ 1195.888644] [drm:drm_helper_probe_single_connector_modes_merge_bits] [CONNECTOR:27:DP-1] disconnected
[ 1195.888647] [drm:drm_mode_getconnector] [CONNECTOR:22:?]
[ 1195.888649] [drm:drm_helper_probe_single_connector_modes_merge_bits] [CONNECTOR:22:HDMI-A-1]
[ 1195.888650] [drm:intel_hdmi_detect] [CONNECTOR:22:HDMI-A-1]
[ 1195.888831] [drm:gmbus_xfer] GMBUS [i915 gmbus dpb] NAK for addr: 0050 r(1)
[ 1195.888834] [drm:drm_do_probe_ddc_edid] drm: skipping non-existent adapter i915 gmbus dpb
[ 1195.888837] [drm:drm_helper_probe_single_connector_modes_merge_bits] [CONNECTOR:22:HDMI-A-1] disconnected
[ 1195.888843] [drm:drm_mode_getconnector] [CONNECTOR:31:?]
[ 1195.888845] [drm:drm_helper_probe_single_connector_modes_merge_bits] [CONNECTOR:31:HDMI-A-2]
[ 1195.888846] [drm:intel_hdmi_detect] [CONNECTOR:31:HDMI-A-2]
[ 1195.889030] [drm:gmbus_xfer] GMBUS [i915 gmbus dpc] NAK for addr: 0050 r(1)
[ 1195.889031] [drm:drm_do_probe_ddc_edid] drm: skipping non-existent adapter i915 gmbus dpc
[ 1195.889033] [drm:drm_helper_probe_single_connector_modes_merge_bits] [CONNECTOR:31:HDMI-A-2] disconnected
[ 1195.889037] [drm:drm_mode_getconnector] [CONNECTOR:33:?]
[ 1195.889038] [drm:drm_helper_probe_single_connector_modes_merge_bits] [CONNECTOR:33:HDMI-A-3]
[ 1195.889039] [drm:intel_hdmi_detect] [CONNECTOR:33:HDMI-A-3]
[ 1195.913977] [drm:drm_detect_monitor_audio] Monitor has basic audio support
[ 1195.914025] [drm:drm_edid_to_eld] ELD monitor DELL P2815Q
[ 1195.914027] [drm:parse_hdmi_vsdb] HDMI: DVI dual 0, max TMDS clock 300, latency present 0 0, video latency 0 3, audio latency 96 2
[ 1195.914028] [drm:drm_edid_to_eld] ELD size 36, SAD count 1
[ 1195.914055] [drm:drm_helper_probe_single_connector_modes_merge_bits] [CONNECTOR:33:HDMI-A-3] probed modes :
[ 1195.914056] [drm:drm_mode_debug_printmodeline] Modeline 36:"3840x2160" 30 297000 3840 4016 4104 4400 2160 2168 2178 2250 0x48 0x5
[ 1195.914058] [drm:drm_mode_debug_printmodeline] Modeline 89:"3840x2160" 30 296704 3840 4016 4104 4400 2160 2168 2178 2250 0x40 0x5
[ 1195.914059] [drm:drm_mode_debug_printmodeline] Modeline 87:"3840x2160" 25 297000 3840 4896 4984 5280 2160 2168 2178 2250 0x40 0x5
[ 1195.914061] [drm:drm_mode_debug_printmodeline] Modeline 86:"3840x2160" 24 297000 3840 5116 5204 5500 2160 2168 2178 2250 0x40 0x5
[ 1195.914062] [drm:drm_mode_debug_printmodeline] Modeline 104:"3840x2160" 24 296704 3840 5116 5204 5500 2160 2168 2178 2250 0x40 0x5
[ 1195.914063] [drm:drm_mode_debug_printmodeline] Modeline 38:"2560x1440" 60 241500 2560 2608 2640 2720 1440 1443 1448 1481 0x40 0x5
[ 1195.914065] [drm:drm_mode_debug_printmodeline] Modeline 46:"1920x1200" 60 154000 1920 1968 2000 2080 1200 1203 1209 1235 0x40 0x9
[ 1195.914066] [drm:drm_mode_debug_printmodeline] Modeline 37:"1920x1080" 60 148500 1920 2008 2052 2200 1080 1084 1089 1125 0x40 0x5
[ 1195.914067] [drm:drm_mode_debug_printmodeline] Modeline 90:"1920x1080" 60 148352 1920 2008 2052 2200 1080 1084 1089 1125 0x40 0x5
[ 1195.914069] [drm:drm_mode_debug_printmodeline] Modeline 72:"1920x1080i" 60 74250 1920 2008 2052 2200 1080 1084 1094 1125 0x40 0x15
[ 1195.914070] [drm:drm_mode_debug_printmodeline] Modeline 100:"1920x1080i" 60 74176 1920 2008 2052 2200 1080 1084 1094 1125 0x40 0x15
[ 1195.914071] [drm:drm_mode_debug_printmodeline] Modeline 57:"1920x1080" 50 148500 1920 2448 2492 2640 1080 1084 1089 1125 0x40 0x5
[ 1195.914073] [drm:drm_mode_debug_printmodeline] Modeline 71:"1920x1080i" 50 74250 1920 2448 2492 2640 1080 1084 1094 1125 0x40 0x15
[ 1195.914074] [drm:drm_mode_debug_printmodeline] Modeline 85:"1920x1080" 30 74250 1920 2008 2052 2200 1080 1084 1089 1125 0x40 0x5
[ 1195.914075] [drm:drm_mode_debug_printmodeline] Modeline 103:"1920x1080" 30 74176 1920 2008 2052 2200 1080 1084 1089 1125 0x40 0x5
[ 1195.914077] [drm:drm_mode_debug_printmodeline] Modeline 79:"1920x1080" 25 74250 1920 2448 2492 2640 1080 1084 1089 1125 0x40 0x5
[ 1195.914078] [drm:drm_mode_debug_printmodeline] Modeline 78:"1920x1080" 24 74250 1920 2558 2602 2750 1080 1084 1089 1125 0x40 0x5
[ 1195.914079] [drm:drm_mode_debug_printmodeline] Modeline 102:"1920x1080" 24 74176 1920 2558 2602 2750 1080 1084 1089 1125 0x40 0x5
[ 1195.914081] [drm:drm_mode_debug_printmodeline] Modeline 44:"1600x1200" 60 162000 1600 1664 1856 2160 1200 1201 1204 1250 0x40 0x5
[ 1195.914082] [drm:drm_mode_debug_printmodeline] Modeline 45:"1680x1050" 60 119000 1680 1728 1760 1840 1050 1053 1059 1080 0x40 0x9
[ 1195.914083] [drm:drm_mode_debug_printmodeline] Modeline 51:"1280x1024" 75 135000 1280 1296 1440 1688 1024 1025 1028 1066 0x40 0x5
[ 1195.914085] [drm:drm_mode_debug_printmodeline] Modeline 43:"1280x1024" 60 108000 1280 1328 1440 1688 1024 1025 1028 1066 0x40 0x5
[ 1195.914086] [drm:drm_mode_debug_printmodeline] Modeline 42:"1280x800" 60 71000 1280 1328 1360 1440 800 803 809 823 0x40 0x9
[ 1195.914087] [drm:drm_mode_debug_printmodeline] Modeline 41:"1152x864" 75 108000 1152 1216 1344 1600 864 865 868 900 0x40 0x5
[ 1195.914089] [drm:drm_mode_debug_printmodeline] Modeline 39:"1280x720" 60 74250 1280 1390 1430 1650 720 725 730 750 0x40 0x5
[ 1195.914090] [drm:drm_mode_debug_printmodeline] Modeline 91:"1280x720" 60 74176 1280 1390 1430 1650 720 725 730 750 0x40 0x5
[ 1195.914091] [drm:drm_mode_debug_printmodeline] Modeline 70:"1280x720" 50 74250 1280 1720 1760 1980 720 725 730 750 0x40 0x5
[ 1195.914093] [drm:drm_mode_debug_printmodeline] Modeline 52:"1024x768" 75 78800 1024 1040 1136 1312 768 769 772 800 0x40 0x5
[ 1195.914094] [drm:drm_mode_debug_printmodeline] Modeline 53:"1024x768" 60 65000 1024 1048 1184 1344 768 771 777 806 0x40 0xa
[ 1195.914095] [drm:drm_mode_debug_printmodeline] Modeline 54:"800x600" 75 49500 800 816 896 1056 600 601 604 625 0x40 0x5
[ 1195.914097] [drm:drm_mode_debug_printmodeline] Modeline 47:"800x600" 60 40000 800 840 968 1056 600 601 605 628 0x40 0x5
[ 1195.914098] [drm:drm_mode_debug_printmodeline] Modeline 73:"720x576" 50 27000 720 732 796 864 576 581 586 625 0x40 0xa
[ 1195.914099] [drm:drm_mode_debug_printmodeline] Modeline 65:"720x576i" 50 13500 720 732 795 864 576 580 586 625 0x40 0x101a
[ 1195.914101] [drm:drm_mode_debug_printmodeline] Modeline 92:"720x480" 60 27027 720 736 798 858 480 489 495 525 0x40 0xa
[ 1195.914102] [drm:drm_mode_debug_printmodeline] Modeline 40:"720x480" 60 27000 720 736 798 858 480 489 495 525 0x40 0xa
[ 1195.914103] [drm:drm_mode_debug_printmodeline] Modeline 98:"720x480i" 60 13513 720 739 801 858 480 488 494 525 0x40 0x101a
[ 1195.914105] [drm:drm_mode_debug_printmodeline] Modeline 64:"720x480i" 60 13500 720 739 801 858 480 488 494 525 0x40 0x101a
[ 1195.914106] [drm:drm_mode_debug_printmodeline] Modeline 48:"640x480" 75 31500 640 656 720 840 480 481 484 500 0x40 0xa
[ 1195.914107] [drm:drm_mode_debug_printmodeline] Modeline 49:"640x480" 60 25200 640 656 752 800 480 490 492 525 0x40 0xa
[ 1195.914109] [drm:drm_mode_debug_printmodeline] Modeline 60:"640x480" 60 25175 640 656 752 800 480 490 492 525 0x40 0xa
[ 1195.914110] [drm:drm_mode_debug_printmodeline] Modeline 50:"720x400" 70 28320 720 738 846 900 400 412 414 449 0x40 0x6
[ 1195.914113] [drm:drm_mode_getconnector] [CONNECTOR:33:?]
[ 1195.914672] [drm:drm_mode_getconnector] [CONNECTOR:19:?]
[ 1195.914674] [drm:drm_helper_probe_single_connector_modes_merge_bits] [CONNECTOR:19:VGA-1]
[ 1195.914675] [drm:intel_crt_detect] [CONNECTOR:19:VGA-1] force=1
[ 1195.914683] [drm:intel_ironlake_crt_detect_hotplug] ironlake hotplug adpa=0xf40000, result 0
[ 1195.914684] [drm:intel_crt_detect] CRT not detected via hotplug
[ 1195.914859] [drm:gmbus_xfer] GMBUS [i915 gmbus dpb] NAK for addr: 0050 r(1)
[ 1195.914860] [drm:drm_do_probe_ddc_edid] drm: skipping non-existent adapter i915 gmbus dpb
[ 1195.914861] [drm:intel_crt_get_edid] CRT GMBUS EDID read failed, retry using GPIO bit-banging
[ 1195.914862] [drm:intel_gmbus_force_bit] enabling bit-banging on i915 gmbus dpb. force bit now 1
[ 1195.915252] [drm:drm_do_probe_ddc_edid] drm: skipping non-existent adapter i915 gmbus dpb
[ 1195.915253] [drm:intel_gmbus_force_bit] disabling bit-banging on i915 gmbus dpb. force bit now 0
[ 1195.915254] [drm:intel_crt_detect_ddc] CRT not detected via DDC:0x50 [no valid EDID found]
[ 1195.915255] [drm:drm_helper_probe_single_connector_modes_merge_bits] [CONNECTOR:19:VGA-1] disconnected
[ 1195.916373] [drm:intel_crtc_cursor_set_obj] cursor off
[ 1195.916529] [drm:add_framebuffer_internal] [FB:56]
[ 1195.925961] [drm:drm_mode_getconnector] [CONNECTOR:27:?]
[ 1195.925966] [drm:drm_helper_probe_single_connector_modes_merge_bits] [CONNECTOR:27:DP-1]
[ 1195.925967] [drm:intel_dp_detect] [CONNECTOR:27:DP-1]
[ 1195.925977] [drm:drm_helper_probe_single_connector_modes_merge_bits] [CONNECTOR:27:DP-1] disconnected
[ 1195.925983] [drm:drm_mode_getconnector] [CONNECTOR:22:?]
[ 1195.925984] [drm:drm_helper_probe_single_connector_modes_merge_bits] [CONNECTOR:22:HDMI-A-1]
[ 1195.925985] [drm:intel_hdmi_detect] [CONNECTOR:22:HDMI-A-1]
[ 1195.926154] [drm:gmbus_xfer] GMBUS [i915 gmbus dpb] NAK for addr: 0050 r(1)
[ 1195.926155] [drm:drm_do_probe_ddc_edid] drm: skipping non-existent adapter i915 gmbus dpb
[ 1195.926156] [drm:drm_helper_probe_single_connector_modes_merge_bits] [CONNECTOR:22:HDMI-A-1] disconnected
[ 1195.926158] [drm:drm_mode_getconnector] [CONNECTOR:31:?]
[ 1195.926159] [drm:drm_helper_probe_single_connector_modes_merge_bits] [CONNECTOR:31:HDMI-A-2]
[ 1195.926160] [drm:intel_hdmi_detect] [CONNECTOR:31:HDMI-A-2]
[ 1195.926325] [drm:gmbus_xfer] GMBUS [i915 gmbus dpc] NAK for addr: 0050 r(1)
[ 1195.926326] [drm:drm_do_probe_ddc_edid] drm: skipping non-existent adapter i915 gmbus dpc
[ 1195.926327] [drm:drm_helper_probe_single_connector_modes_merge_bits] [CONNECTOR:31:HDMI-A-2] disconnected
[ 1195.926337] [drm:drm_mode_getconnector] [CONNECTOR:33:?]
[ 1195.926338] [drm:drm_helper_probe_single_connector_modes_merge_bits] [CONNECTOR:33:HDMI-A-3]
[ 1195.926344] [drm:intel_hdmi_detect] [CONNECTOR:33:HDMI-A-3]
[ 1195.951146] [drm:drm_detect_monitor_audio] Monitor has basic audio support
[ 1195.951198] [drm:drm_edid_to_eld] ELD monitor DELL P2815Q
[ 1195.951200] [drm:parse_hdmi_vsdb] HDMI: DVI dual 0, max TMDS clock 300, latency present 0 0, video latency 0 3, audio latency 96 2
[ 1195.951201] [drm:drm_edid_to_eld] ELD size 36, SAD count 1
[ 1195.951234] [drm:drm_helper_probe_single_connector_modes_merge_bits] [CONNECTOR:33:HDMI-A-3] probed modes :
[ 1195.951236] [drm:drm_mode_debug_printmodeline] Modeline 36:"3840x2160" 30 297000 3840 4016 4104 4400 2160 2168 2178 2250 0x48 0x5
[ 1195.951237] [drm:drm_mode_debug_printmodeline] Modeline 89:"3840x2160" 30 296704 3840 4016 4104 4400 2160 2168 2178 2250 0x40 0x5
[ 1195.951239] [drm:drm_mode_debug_printmodeline] Modeline 87:"3840x2160" 25 297000 3840 4896 4984 5280 2160 2168 2178 2250 0x40 0x5
[ 1195.951240] [drm:drm_mode_debug_printmodeline] Modeline 86:"3840x2160" 24 297000 3840 5116 5204 5500 2160 2168 2178 2250 0x40 0x5
[ 1195.951241] [drm:drm_mode_debug_printmodeline] Modeline 104:"3840x2160" 24 296704 3840 5116 5204 5500 2160 2168 2178 2250 0x40 0x5
[ 1195.951243] [drm:drm_mode_debug_printmodeline] Modeline 38:"2560x1440" 60 241500 2560 2608 2640 2720 1440 1443 1448 1481 0x40 0x5
[ 1195.951244] [drm:drm_mode_debug_printmodeline] Modeline 46:"1920x1200" 60 154000 1920 1968 2000 2080 1200 1203 1209 1235 0x40 0x9
[ 1195.951245] [drm:drm_mode_debug_printmodeline] Modeline 37:"1920x1080" 60 148500 1920 2008 2052 2200 1080 1084 1089 1125 0x40 0x5
[ 1195.951246] [drm:drm_mode_debug_printmodeline] Modeline 90:"1920x1080" 60 148352 1920 2008 2052 2200 1080 1084 1089 1125 0x40 0x5
[ 1195.951248] [drm:drm_mode_debug_printmodeline] Modeline 72:"1920x1080i" 60 74250 1920 2008 2052 2200 1080 1084 1094 1125 0x40 0x15
[ 1195.951249] [drm:drm_mode_debug_printmodeline] Modeline 100:"1920x1080i" 60 74176 1920 2008 2052 2200 1080 1084 1094 1125 0x40 0x15
[ 1195.951251] [drm:drm_mode_debug_printmodeline] Modeline 57:"1920x1080" 50 148500 1920 2448 2492 2640 1080 1084 1089 1125 0x40 0x5
[ 1195.951252] [drm:drm_mode_debug_printmodeline] Modeline 71:"1920x1080i" 50 74250 1920 2448 2492 2640 1080 1084 1094 1125 0x40 0x15
[ 1195.951253] [drm:drm_mode_debug_printmodeline] Modeline 85:"1920x1080" 30 74250 1920 2008 2052 2200 1080 1084 1089 1125 0x40 0x5
[ 1195.951254] [drm:drm_mode_debug_printmodeline] Modeline 103:"1920x1080" 30 74176 1920 2008 2052 2200 1080 1084 1089 1125 0x40 0x5
[ 1195.951256] [drm:drm_mode_debug_printmodeline] Modeline 79:"1920x1080" 25 74250 1920 2448 2492 2640 1080 1084 1089 1125 0x40 0x5
[ 1195.951257] [drm:drm_mode_debug_printmodeline] Modeline 78:"1920x1080" 24 74250 1920 2558 2602 2750 1080 1084 1089 1125 0x40 0x5
[ 1195.951258] [drm:drm_mode_debug_printmodeline] Modeline 102:"1920x1080" 24 74176 1920 2558 2602 2750 1080 1084 1089 1125 0x40 0x5
[ 1195.951260] [drm:drm_mode_debug_printmodeline] Modeline 44:"1600x1200" 60 162000 1600 1664 1856 2160 1200 1201 1204 1250 0x40 0x5
[ 1195.951261] [drm:drm_mode_debug_printmodeline] Modeline 45:"1680x1050" 60 119000 1680 1728 1760 1840 1050 1053 1059 1080 0x40 0x9
[ 1195.951262] [drm:drm_mode_debug_printmodeline] Modeline 51:"1280x1024" 75 135000 1280 1296 1440 1688 1024 1025 1028 1066 0x40 0x5
[ 1195.951264] [drm:drm_mode_debug_printmodeline] Modeline 43:"1280x1024" 60 108000 1280 1328 1440 1688 1024 1025 1028 1066 0x40 0x5
[ 1195.951265] [drm:drm_mode_debug_printmodeline] Modeline 42:"1280x800" 60 71000 1280 1328 1360 1440 800 803 809 823 0x40 0x9
[ 1195.951266] [drm:drm_mode_debug_printmodeline] Modeline 41:"1152x864" 75 108000 1152 1216 1344 1600 864 865 868 900 0x40 0x5
[ 1195.951268] [drm:drm_mode_debug_printmodeline] Modeline 39:"1280x720" 60 74250 1280 1390 1430 1650 720 725 730 750 0x40 0x5
[ 1195.951269] [drm:drm_mode_debug_printmodeline] Modeline 91:"1280x720" 60 74176 1280 1390 1430 1650 720 725 730 750 0x40 0x5
[ 1195.951270] [drm:drm_mode_debug_printmodeline] Modeline 70:"1280x720" 50 74250 1280 1720 1760 1980 720 725 730 750 0x40 0x5
[ 1195.951272] [drm:drm_mode_debug_printmodeline] Modeline 52:"1024x768" 75 78800 1024 1040 1136 1312 768 769 772 800 0x40 0x5
[ 1195.951273] [drm:drm_mode_debug_printmodeline] Modeline 53:"1024x768" 60 65000 1024 1048 1184 1344 768 771 777 806 0x40 0xa
[ 1195.951274] [drm:drm_mode_debug_printmodeline] Modeline 54:"800x600" 75 49500 800 816 896 1056 600 601 604 625 0x40 0x5
[ 1195.951276] [drm:drm_mode_debug_printmodeline] Modeline 47:"800x600" 60 40000 800 840 968 1056 600 601 605 628 0x40 0x5
[ 1195.951277] [drm:drm_mode_debug_printmodeline] Modeline 73:"720x576" 50 27000 720 732 796 864 576 581 586 625 0x40 0xa
[ 1195.951278] [drm:drm_mode_debug_printmodeline] Modeline 65:"720x576i" 50 13500 720 732 795 864 576 580 586 625 0x40 0x101a
[ 1195.951280] [drm:drm_mode_debug_printmodeline] Modeline 92:"720x480" 60 27027 720 736 798 858 480 489 495 525 0x40 0xa
[ 1195.951281] [drm:drm_mode_debug_printmodeline] Modeline 40:"720x480" 60 27000 720 736 798 858 480 489 495 525 0x40 0xa
[ 1195.951282] [drm:drm_mode_debug_printmodeline] Modeline 98:"720x480i" 60 13513 720 739 801 858 480 488 494 525 0x40 0x101a
[ 1195.951284] [drm:drm_mode_debug_printmodeline] Modeline 64:"720x480i" 60 13500 720 739 801 858 480 488 494 525 0x40 0x101a
[ 1195.951285] [drm:drm_mode_debug_printmodeline] Modeline 48:"640x480" 75 31500 640 656 720 840 480 481 484 500 0x40 0xa
[ 1195.951286] [drm:drm_mode_debug_printmodeline] Modeline 49:"640x480" 60 25200 640 656 752 800 480 490 492 525 0x40 0xa
[ 1195.951287] [drm:drm_mode_debug_printmodeline] Modeline 60:"640x480" 60 25175 640 656 752 800 480 490 492 525 0x40 0xa
[ 1195.951289] [drm:drm_mode_debug_printmodeline] Modeline 50:"720x400" 70 28320 720 738 846 900 400 412 414 449 0x40 0x6
[ 1195.951297] [drm:drm_mode_getconnector] [CONNECTOR:33:?]
[ 1195.951351] [drm:drm_mode_getconnector] [CONNECTOR:19:?]
[ 1195.951353] [drm:drm_helper_probe_single_connector_modes_merge_bits] [CONNECTOR:19:VGA-1]
[ 1195.951355] [drm:intel_crt_detect] [CONNECTOR:19:VGA-1] force=1
[ 1195.951363] [drm:intel_ironlake_crt_detect_hotplug] ironlake hotplug adpa=0xf40000, result 0
[ 1195.951363] [drm:intel_crt_detect] CRT not detected via hotplug
[ 1195.951529] [drm:gmbus_xfer] GMBUS [i915 gmbus dpb] NAK for addr: 0050 r(1)
[ 1195.951530] [drm:drm_do_probe_ddc_edid] drm: skipping non-existent adapter i915 gmbus dpb
[ 1195.951531] [drm:intel_crt_get_edid] CRT GMBUS EDID read failed, retry using GPIO bit-banging
[ 1195.951532] [drm:intel_gmbus_force_bit] enabling bit-banging on i915 gmbus dpb. force bit now 1
[ 1195.952042] [drm:drm_do_probe_ddc_edid] drm: skipping non-existent adapter i915 gmbus dpb
[ 1195.952043] [drm:intel_gmbus_force_bit] disabling bit-banging on i915 gmbus dpb. force bit now 0
[ 1195.952044] [drm:intel_crt_detect_ddc] CRT not detected via DDC:0x50 [no valid EDID found]
[ 1195.952045] [drm:drm_helper_probe_single_connector_modes_merge_bits] [CONNECTOR:19:VGA-1] disconnected
[ 1196.852567] [drm:intel_hpd_irq_handler] hotplug event received, stat 0x00800000, dig 0x00121010
[ 1196.852570] [drm:intel_hpd_irq_handler] Received HPD interrupt on PIN 6 - cnt: 0
[ 1196.852588] [drm:i915_hotplug_work_func] running encoder hotplug functions
[ 1196.852591] [drm:i915_hotplug_work_func] Connector HDMI-A-3 (pin 6) received hotplug event.
[ 1196.852592] [drm:intel_hdmi_detect] [CONNECTOR:33:HDMI-A-3]
[ 1196.852762] [drm:gmbus_xfer] GMBUS [i915 gmbus dpd] NAK for addr: 0050 r(1)
[ 1196.852765] [drm:drm_do_probe_ddc_edid] drm: skipping non-existent adapter i915 gmbus dpd
[ 1196.852767] [drm:intel_hpd_irq_event] [CONNECTOR:33:HDMI-A-3] status updated from connected to disconnected
[ 1196.853324] [drm:drm_mode_getresources] CRTC[3] CONNECTORS[5] ENCODERS[7]
[ 1196.853335] [drm:drm_mode_getconnector] [CONNECTOR:27:?]
[ 1196.853336] [drm:drm_helper_probe_single_connector_modes_merge_bits] [CONNECTOR:27:DP-1]
[ 1196.853338] [drm:intel_dp_detect] [CONNECTOR:27:DP-1]
[ 1196.853347] [drm:drm_helper_probe_single_connector_modes_merge_bits] [CONNECTOR:27:DP-1] disconnected
[ 1196.853350] [drm:drm_mode_getconnector] [CONNECTOR:22:?]
[ 1196.853351] [drm:drm_helper_probe_single_connector_modes_merge_bits] [CONNECTOR:22:HDMI-A-1]
[ 1196.853352] [drm:intel_hdmi_detect] [CONNECTOR:22:HDMI-A-1]
[ 1196.853535] [drm:gmbus_xfer] GMBUS [i915 gmbus dpb] NAK for addr: 0050 r(1)
[ 1196.853537] [drm:drm_do_probe_ddc_edid] drm: skipping non-existent adapter i915 gmbus dpb
[ 1196.853539] [drm:drm_helper_probe_single_connector_modes_merge_bits] [CONNECTOR:22:HDMI-A-1] disconnected
[ 1196.853543] [drm:drm_mode_getconnector] [CONNECTOR:31:?]
[ 1196.853545] [drm:drm_helper_probe_single_connector_modes_merge_bits] [CONNECTOR:31:HDMI-A-2]
[ 1196.853545] [drm:intel_hdmi_detect] [CONNECTOR:31:HDMI-A-2]
[ 1196.853725] [drm:gmbus_xfer] GMBUS [i915 gmbus dpc] NAK for addr: 0050 r(1)
[ 1196.853726] [drm:drm_do_probe_ddc_edid] drm: skipping non-existent adapter i915 gmbus dpc
[ 1196.853728] [drm:drm_helper_probe_single_connector_modes_merge_bits] [CONNECTOR:31:HDMI-A-2] disconnected
[ 1196.853735] [drm:drm_mode_getconnector] [CONNECTOR:33:?]
[ 1196.853736] [drm:drm_helper_probe_single_connector_modes_merge_bits] [CONNECTOR:33:HDMI-A-3]
[ 1196.853740] [drm:intel_hdmi_detect] [CONNECTOR:33:HDMI-A-3]
[ 1196.853913] [drm:gmbus_xfer] GMBUS [i915 gmbus dpd] NAK for addr: 0050 r(1)
[ 1196.853914] [drm:drm_do_probe_ddc_edid] drm: skipping non-existent adapter i915 gmbus dpd
[ 1196.853915] [drm:drm_helper_probe_single_connector_modes_merge_bits] [CONNECTOR:33:HDMI-A-3] disconnected
[ 1196.854006] [drm:drm_mode_getconnector] [CONNECTOR:19:?]
[ 1196.854008] [drm:drm_helper_probe_single_connector_modes_merge_bits] [CONNECTOR:19:VGA-1]
[ 1196.854010] [drm:intel_crt_detect] [CONNECTOR:19:VGA-1] force=1
[ 1196.854019] [drm:intel_ironlake_crt_detect_hotplug] ironlake hotplug adpa=0xf40000, result 0
[ 1196.854020] [drm:intel_crt_detect] CRT not detected via hotplug
[ 1196.854179] [drm:gmbus_xfer] GMBUS [i915 gmbus dpb] NAK for addr: 0050 r(1)
[ 1196.854180] [drm:drm_do_probe_ddc_edid] drm: skipping non-existent adapter i915 gmbus dpb
[ 1196.854181] [drm:intel_crt_get_edid] CRT GMBUS EDID read failed, retry using GPIO bit-banging
[ 1196.854182] [drm:intel_gmbus_force_bit] enabling bit-banging on i915 gmbus dpb. force bit now 1
[ 1196.854706] [drm:drm_do_probe_ddc_edid] drm: skipping non-existent adapter i915 gmbus dpb
[ 1196.854707] [drm:intel_gmbus_force_bit] disabling bit-banging on i915 gmbus dpb. force bit now 0
[ 1196.854708] [drm:intel_crt_detect_ddc] CRT not detected via DDC:0x50 [no valid EDID found]
[ 1196.854709] [drm:drm_helper_probe_single_connector_modes_merge_bits] [CONNECTOR:19:VGA-1] disconnected
[ 1196.856538] [drm:drm_mode_getconnector] [CONNECTOR:27:?]
[ 1196.856541] [drm:drm_helper_probe_single_connector_modes_merge_bits] [CONNECTOR:27:DP-1]
[ 1196.856543] [drm:intel_dp_detect] [CONNECTOR:27:DP-1]
[ 1196.856552] [drm:drm_helper_probe_single_connector_modes_merge_bits] [CONNECTOR:27:DP-1] disconnected
[ 1196.856554] [drm:drm_mode_getconnector] [CONNECTOR:22:?]
[ 1196.856555] [drm:drm_helper_probe_single_connector_modes_merge_bits] [CONNECTOR:22:HDMI-A-1]
[ 1196.856556] [drm:intel_hdmi_detect] [CONNECTOR:22:HDMI-A-1]
[ 1196.856723] [drm:gmbus_xfer] GMBUS [i915 gmbus dpb] NAK for addr: 0050 r(1)
[ 1196.856724] [drm:drm_do_probe_ddc_edid] drm: skipping non-existent adapter i915 gmbus dpb
[ 1196.856725] [drm:drm_helper_probe_single_connector_modes_merge_bits] [CONNECTOR:22:HDMI-A-1] disconnected
[ 1196.856727] [drm:drm_mode_getconnector] [CONNECTOR:31:?]
[ 1196.856728] [drm:drm_helper_probe_single_connector_modes_merge_bits] [CONNECTOR:31:HDMI-A-2]
[ 1196.856729] [drm:intel_hdmi_detect] [CONNECTOR:31:HDMI-A-2]
[ 1196.856897] [drm:gmbus_xfer] GMBUS [i915 gmbus dpc] NAK for addr: 0050 r(1)
[ 1196.856898] [drm:drm_do_probe_ddc_edid] drm: skipping non-existent adapter i915 gmbus dpc
[ 1196.856899] [drm:drm_helper_probe_single_connector_modes_merge_bits] [CONNECTOR:31:HDMI-A-2] disconnected
[ 1196.856901] [drm:drm_mode_getconnector] [CONNECTOR:33:?]
[ 1196.856901] [drm:drm_helper_probe_single_connector_modes_merge_bits] [CONNECTOR:33:HDMI-A-3]
[ 1196.856902] [drm:intel_hdmi_detect] [CONNECTOR:33:HDMI-A-3]
[ 1196.857064] [drm:gmbus_xfer] GMBUS [i915 gmbus dpd] NAK for addr: 0050 r(1)
[ 1196.857065] [drm:drm_do_probe_ddc_edid] drm: skipping non-existent adapter i915 gmbus dpd
[ 1196.857066] [drm:drm_helper_probe_single_connector_modes_merge_bits] [CONNECTOR:33:HDMI-A-3] disconnected
[ 1196.857068] [drm:drm_mode_getconnector] [CONNECTOR:19:?]
[ 1196.857069] [drm:drm_helper_probe_single_connector_modes_merge_bits] [CONNECTOR:19:VGA-1]
[ 1196.857070] [drm:intel_crt_detect] [CONNECTOR:19:VGA-1] force=1
[ 1196.857076] [drm:intel_ironlake_crt_detect_hotplug] ironlake hotplug adpa=0xf40000, result 0
[ 1196.857077] [drm:intel_crt_detect] CRT not detected via hotplug
[ 1196.857236] [drm:gmbus_xfer] GMBUS [i915 gmbus dpb] NAK for addr: 0050 r(1)
[ 1196.857238] [drm:drm_do_probe_ddc_edid] drm: skipping non-existent adapter i915 gmbus dpb
[ 1196.857240] [drm:intel_crt_get_edid] CRT GMBUS EDID read failed, retry using GPIO bit-banging
[ 1196.857241] [drm:intel_gmbus_force_bit] enabling bit-banging on i915 gmbus dpb. force bit now 1
[ 1196.857758] [drm:drm_do_probe_ddc_edid] drm: skipping non-existent adapter i915 gmbus dpb
[ 1196.857759] [drm:intel_gmbus_force_bit] disabling bit-banging on i915 gmbus dpb. force bit now 0
[ 1196.857760] [drm:intel_crt_detect_ddc] CRT not detected via DDC:0x50 [no valid EDID found]
[ 1196.857761] [drm:drm_helper_probe_single_connector_modes_merge_bits] [CONNECTOR:19:VGA-1] disconnected
[ 1196.986678] [drm:intel_hpd_irq_handler] hotplug event received, stat 0x00800000, dig 0x00121010
[ 1196.986680] [drm:intel_hpd_irq_handler] Received HPD interrupt on PIN 6 - cnt: 1
[ 1196.986696] [drm:i915_hotplug_work_func] running encoder hotplug functions
[ 1196.986697] [drm:i915_hotplug_work_func] Connector HDMI-A-3 (pin 6) received hotplug event.
[ 1196.986698] [drm:intel_hdmi_detect] [CONNECTOR:33:HDMI-A-3]
[ 1196.993809] [drm:intel_hpd_irq_handler] hotplug event received, stat 0x00800000, dig 0x00121010
[ 1196.993810] [drm:intel_hpd_irq_handler] Received HPD interrupt on PIN 6 - cnt: 2
[ 1196.999369] [drm:drm_edid_block_valid [drm]] *ERROR* EDID checksum is invalid, remainder is 212
[ 1196.999371] Raw EDID:
[ 1196.999372]  	00 ff ff ff ff ff ff 00 10 ac 5c f0 4d 54 31 41
[ 1196.999373]  	24 18 01 03 80 3e 22 78 ea 0a a5 a2 57 4f a2 28
[ 1196.999373]  	0f 50 54 a5 4b 00 71 4f 81 00 81 80 a9 40 ff ff
[ 1196.999374]  	ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[ 1196.999375]  	ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[ 1196.999376]  	ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[ 1196.999376]  	ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[ 1196.999377]  	ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[ 1196.999541] [drm:gmbus_xfer] GMBUS [i915 gmbus dpd] NAK for addr: 0050 r(128)
[ 1196.999542] [drm:drm_do_probe_ddc_edid] drm: skipping non-existent adapter i915 gmbus dpd
[ 1196.999543] [drm:i915_hotplug_work_func] running encoder hotplug functions
[ 1196.999544] [drm:i915_hotplug_work_func] Connector HDMI-A-3 (pin 6) received hotplug event.
[ 1196.999545] [drm:intel_hdmi_detect] [CONNECTOR:33:HDMI-A-3]
[ 1196.999708] [drm:gmbus_xfer] GMBUS [i915 gmbus dpd] NAK for addr: 0050 r(1)
[ 1196.999709] [drm:drm_do_probe_ddc_edid] drm: skipping non-existent adapter i915 gmbus dpd
[ 1198.167756] [drm:intel_hpd_irq_handler] hotplug event received, stat 0x00800000, dig 0x00121010
[ 1198.167758] [drm:intel_hpd_irq_handler] Received HPD interrupt on PIN 6 - cnt: 0
[ 1198.167775] [drm:i915_hotplug_work_func] running encoder hotplug functions
[ 1198.167776] [drm:i915_hotplug_work_func] Connector HDMI-A-3 (pin 6) received hotplug event.
[ 1198.167777] [drm:intel_hdmi_detect] [CONNECTOR:33:HDMI-A-3]
[ 1198.192762] [drm:drm_detect_monitor_audio] Monitor has basic audio support
[ 1198.192765] [drm:intel_hpd_irq_event] [CONNECTOR:33:HDMI-A-3] status updated from disconnected to connected
[ 1198.193267] [drm:drm_mode_getresources] CRTC[3] CONNECTORS[5] ENCODERS[7]
[ 1198.193275] [drm:drm_mode_getconnector] [CONNECTOR:27:?]
[ 1198.193277] [drm:drm_helper_probe_single_connector_modes_merge_bits] [CONNECTOR:27:DP-1]
[ 1198.193278] [drm:intel_dp_detect] [CONNECTOR:27:DP-1]
[ 1198.193286] [drm:drm_helper_probe_single_connector_modes_merge_bits] [CONNECTOR:27:DP-1] disconnected
[ 1198.193290] [drm:drm_mode_getconnector] [CONNECTOR:22:?]
[ 1198.193291] [drm:drm_helper_probe_single_connector_modes_merge_bits] [CONNECTOR:22:HDMI-A-1]
[ 1198.193291] [drm:intel_hdmi_detect] [CONNECTOR:22:HDMI-A-1]
[ 1198.193467] [drm:gmbus_xfer] GMBUS [i915 gmbus dpb] NAK for addr: 0050 r(1)
[ 1198.193469] [drm:drm_do_probe_ddc_edid] drm: skipping non-existent adapter i915 gmbus dpb
[ 1198.193471] [drm:drm_helper_probe_single_connector_modes_merge_bits] [CONNECTOR:22:HDMI-A-1] disconnected
[ 1198.193475] [drm:drm_mode_getconnector] [CONNECTOR:31:?]
[ 1198.193476] [drm:drm_helper_probe_single_connector_modes_merge_bits] [CONNECTOR:31:HDMI-A-2]
[ 1198.193477] [drm:intel_hdmi_detect] [CONNECTOR:31:HDMI-A-2]
[ 1198.193651] [drm:gmbus_xfer] GMBUS [i915 gmbus dpc] NAK for addr: 0050 r(1)
[ 1198.193652] [drm:drm_do_probe_ddc_edid] drm: skipping non-existent adapter i915 gmbus dpc
[ 1198.193653] [drm:drm_helper_probe_single_connector_modes_merge_bits] [CONNECTOR:31:HDMI-A-2] disconnected
[ 1198.193656] [drm:drm_mode_getconnector] [CONNECTOR:33:?]
[ 1198.193657] [drm:drm_helper_probe_single_connector_modes_merge_bits] [CONNECTOR:33:HDMI-A-3]
[ 1198.193658] [drm:intel_hdmi_detect] [CONNECTOR:33:HDMI-A-3]
[ 1198.218638] [drm:drm_detect_monitor_audio] Monitor has basic audio support
[ 1198.218687] [drm:drm_edid_to_eld] ELD monitor DELL P2815Q
[ 1198.218689] [drm:parse_hdmi_vsdb] HDMI: DVI dual 0, max TMDS clock 300, latency present 0 0, video latency 0 3, audio latency 96 2
[ 1198.218690] [drm:drm_edid_to_eld] ELD size 36, SAD count 1
[ 1198.218717] [drm:drm_helper_probe_single_connector_modes_merge_bits] [CONNECTOR:33:HDMI-A-3] probed modes :
[ 1198.218719] [drm:drm_mode_debug_printmodeline] Modeline 36:"3840x2160" 30 297000 3840 4016 4104 4400 2160 2168 2178 2250 0x48 0x5
[ 1198.218720] [drm:drm_mode_debug_printmodeline] Modeline 90:"3840x2160" 30 296704 3840 4016 4104 4400 2160 2168 2178 2250 0x40 0x5
[ 1198.218722] [drm:drm_mode_debug_printmodeline] Modeline 88:"3840x2160" 25 297000 3840 4896 4984 5280 2160 2168 2178 2250 0x40 0x5
[ 1198.218723] [drm:drm_mode_debug_printmodeline] Modeline 87:"3840x2160" 24 297000 3840 5116 5204 5500 2160 2168 2178 2250 0x40 0x5
[ 1198.218724] [drm:drm_mode_debug_printmodeline] Modeline 105:"3840x2160" 24 296704 3840 5116 5204 5500 2160 2168 2178 2250 0x40 0x5
[ 1198.218726] [drm:drm_mode_debug_printmodeline] Modeline 38:"2560x1440" 60 241500 2560 2608 2640 2720 1440 1443 1448 1481 0x40 0x5
[ 1198.218727] [drm:drm_mode_debug_printmodeline] Modeline 46:"1920x1200" 60 154000 1920 1968 2000 2080 1200 1203 1209 1235 0x40 0x9
[ 1198.218728] [drm:drm_mode_debug_printmodeline] Modeline 37:"1920x1080" 60 148500 1920 2008 2052 2200 1080 1084 1089 1125 0x40 0x5
[ 1198.218730] [drm:drm_mode_debug_printmodeline] Modeline 91:"1920x1080" 60 148352 1920 2008 2052 2200 1080 1084 1089 1125 0x40 0x5
[ 1198.218731] [drm:drm_mode_debug_printmodeline] Modeline 73:"1920x1080i" 60 74250 1920 2008 2052 2200 1080 1084 1094 1125 0x40 0x15
[ 1198.218732] [drm:drm_mode_debug_printmodeline] Modeline 101:"1920x1080i" 60 74176 1920 2008 2052 2200 1080 1084 1094 1125 0x40 0x15
[ 1198.218734] [drm:drm_mode_debug_printmodeline] Modeline 60:"1920x1080" 50 148500 1920 2448 2492 2640 1080 1084 1089 1125 0x40 0x5
[ 1198.218735] [drm:drm_mode_debug_printmodeline] Modeline 72:"1920x1080i" 50 74250 1920 2448 2492 2640 1080 1084 1094 1125 0x40 0x15
[ 1198.218736] [drm:drm_mode_debug_printmodeline] Modeline 86:"1920x1080" 30 74250 1920 2008 2052 2200 1080 1084 1089 1125 0x40 0x5
[ 1198.218738] [drm:drm_mode_debug_printmodeline] Modeline 104:"1920x1080" 30 74176 1920 2008 2052 2200 1080 1084 1089 1125 0x40 0x5
[ 1198.218739] [drm:drm_mode_debug_printmodeline] Modeline 85:"1920x1080" 25 74250 1920 2448 2492 2640 1080 1084 1089 1125 0x40 0x5
[ 1198.218740] [drm:drm_mode_debug_printmodeline] Modeline 79:"1920x1080" 24 74250 1920 2558 2602 2750 1080 1084 1089 1125 0x40 0x5
[ 1198.218742] [drm:drm_mode_debug_printmodeline] Modeline 103:"1920x1080" 24 74176 1920 2558 2602 2750 1080 1084 1089 1125 0x40 0x5
[ 1198.218743] [drm:drm_mode_debug_printmodeline] Modeline 44:"1600x1200" 60 162000 1600 1664 1856 2160 1200 1201 1204 1250 0x40 0x5
[ 1198.218744] [drm:drm_mode_debug_printmodeline] Modeline 45:"1680x1050" 60 119000 1680 1728 1760 1840 1050 1053 1059 1080 0x40 0x9
[ 1198.218746] [drm:drm_mode_debug_printmodeline] Modeline 51:"1280x1024" 75 135000 1280 1296 1440 1688 1024 1025 1028 1066 0x40 0x5
[ 1198.218747] [drm:drm_mode_debug_printmodeline] Modeline 43:"1280x1024" 60 108000 1280 1328 1440 1688 1024 1025 1028 1066 0x40 0x5
[ 1198.218748] [drm:drm_mode_debug_printmodeline] Modeline 42:"1280x800" 60 71000 1280 1328 1360 1440 800 803 809 823 0x40 0x9
[ 1198.218750] [drm:drm_mode_debug_printmodeline] Modeline 41:"1152x864" 75 108000 1152 1216 1344 1600 864 865 868 900 0x40 0x5
[ 1198.218751] [drm:drm_mode_debug_printmodeline] Modeline 39:"1280x720" 60 74250 1280 1390 1430 1650 720 725 730 750 0x40 0x5
[ 1198.218752] [drm:drm_mode_debug_printmodeline] Modeline 92:"1280x720" 60 74176 1280 1390 1430 1650 720 725 730 750 0x40 0x5
[ 1198.218753] [drm:drm_mode_debug_printmodeline] Modeline 71:"1280x720" 50 74250 1280 1720 1760 1980 720 725 730 750 0x40 0x5
[ 1198.218755] [drm:drm_mode_debug_printmodeline] Modeline 52:"1024x768" 75 78800 1024 1040 1136 1312 768 769 772 800 0x40 0x5
[ 1198.218756] [drm:drm_mode_debug_printmodeline] Modeline 53:"1024x768" 60 65000 1024 1048 1184 1344 768 771 777 806 0x40 0xa
[ 1198.218757] [drm:drm_mode_debug_printmodeline] Modeline 54:"800x600" 75 49500 800 816 896 1056 600 601 604 625 0x40 0x5
[ 1198.218759] [drm:drm_mode_debug_printmodeline] Modeline 47:"800x600" 60 40000 800 840 968 1056 600 601 605 628 0x40 0x5
[ 1198.218760] [drm:drm_mode_debug_printmodeline] Modeline 74:"720x576" 50 27000 720 732 796 864 576 581 586 625 0x40 0xa
[ 1198.218761] [drm:drm_mode_debug_printmodeline] Modeline 66:"720x576i" 50 13500 720 732 795 864 576 580 586 625 0x40 0x101a
[ 1198.218763] [drm:drm_mode_debug_printmodeline] Modeline 93:"720x480" 60 27027 720 736 798 858 480 489 495 525 0x40 0xa
[ 1198.218764] [drm:drm_mode_debug_printmodeline] Modeline 40:"720x480" 60 27000 720 736 798 858 480 489 495 525 0x40 0xa
[ 1198.218765] [drm:drm_mode_debug_printmodeline] Modeline 99:"720x480i" 60 13513 720 739 801 858 480 488 494 525 0x40 0x101a
[ 1198.218767] [drm:drm_mode_debug_printmodeline] Modeline 65:"720x480i" 60 13500 720 739 801 858 480 488 494 525 0x40 0x101a
[ 1198.218768] [drm:drm_mode_debug_printmodeline] Modeline 48:"640x480" 75 31500 640 656 720 840 480 481 484 500 0x40 0xa
[ 1198.218769] [drm:drm_mode_debug_printmodeline] Modeline 49:"640x480" 60 25200 640 656 752 800 480 490 492 525 0x40 0xa
[ 1198.218771] [drm:drm_mode_debug_printmodeline] Modeline 61:"640x480" 60 25175 640 656 752 800 480 490 492 525 0x40 0xa
[ 1198.218772] [drm:drm_mode_debug_printmodeline] Modeline 50:"720x400" 70 28320 720 738 846 900 400 412 414 449 0x40 0x6
[ 1198.218775] [drm:drm_mode_getconnector] [CONNECTOR:33:?]
[ 1198.218979] [drm:drm_mode_getconnector] [CONNECTOR:19:?]
[ 1198.218980] [drm:drm_helper_probe_single_connector_modes_merge_bits] [CONNECTOR:19:VGA-1]
[ 1198.218981] [drm:intel_crt_detect] [CONNECTOR:19:VGA-1] force=1
[ 1198.218989] [drm:intel_ironlake_crt_detect_hotplug] ironlake hotplug adpa=0xf40000, result 0
[ 1198.218990] [drm:intel_crt_detect] CRT not detected via hotplug
[ 1198.219166] [drm:gmbus_xfer] GMBUS [i915 gmbus dpb] NAK for addr: 0050 r(1)
[ 1198.219167] [drm:drm_do_probe_ddc_edid] drm: skipping non-existent adapter i915 gmbus dpb
[ 1198.219168] [drm:intel_crt_get_edid] CRT GMBUS EDID read failed, retry using GPIO bit-banging
[ 1198.219169] [drm:intel_gmbus_force_bit] enabling bit-banging on i915 gmbus dpb. force bit now 1
[ 1198.219686] [drm:drm_do_probe_ddc_edid] drm: skipping non-existent adapter i915 gmbus dpb
[ 1198.219687] [drm:intel_gmbus_force_bit] disabling bit-banging on i915 gmbus dpb. force bit now 0
[ 1198.219688] [drm:intel_crt_detect_ddc] CRT not detected via DDC:0x50 [no valid EDID found]
[ 1198.219689] [drm:drm_helper_probe_single_connector_modes_merge_bits] [CONNECTOR:19:VGA-1] disconnected
[ 1198.220864] [drm:intel_crtc_cursor_set_obj] cursor off
[ 1198.221013] [drm:add_framebuffer_internal] [FB:57]
[ 1198.221296] [drm:drm_mode_getconnector] [CONNECTOR:27:?]
[ 1198.221298] [drm:drm_helper_probe_single_connector_modes_merge_bits] [CONNECTOR:27:DP-1]
[ 1198.221300] [drm:intel_dp_detect] [CONNECTOR:27:DP-1]
[ 1198.221308] [drm:drm_helper_probe_single_connector_modes_merge_bits] [CONNECTOR:27:DP-1] disconnected
[ 1198.221312] [drm:drm_mode_getconnector] [CONNECTOR:22:?]
[ 1198.221313] [drm:drm_helper_probe_single_connector_modes_merge_bits] [CONNECTOR:22:HDMI-A-1]
[ 1198.221314] [drm:intel_hdmi_detect] [CONNECTOR:22:HDMI-A-1]
[ 1198.221481] [drm:gmbus_xfer] GMBUS [i915 gmbus dpb] NAK for addr: 0050 r(1)
[ 1198.221483] [drm:drm_do_probe_ddc_edid] drm: skipping non-existent adapter i915 gmbus dpb
[ 1198.221484] [drm:drm_helper_probe_single_connector_modes_merge_bits] [CONNECTOR:22:HDMI-A-1] disconnected
[ 1198.221487] [drm:drm_mode_getconnector] [CONNECTOR:31:?]
[ 1198.221487] [drm:drm_helper_probe_single_connector_modes_merge_bits] [CONNECTOR:31:HDMI-A-2]
[ 1198.221488] [drm:intel_hdmi_detect] [CONNECTOR:31:HDMI-A-2]
[ 1198.221651] [drm:gmbus_xfer] GMBUS [i915 gmbus dpc] NAK for addr: 0050 r(1)
[ 1198.221652] [drm:drm_do_probe_ddc_edid] drm: skipping non-existent adapter i915 gmbus dpc
[ 1198.221652] [drm:drm_helper_probe_single_connector_modes_merge_bits] [CONNECTOR:31:HDMI-A-2] disconnected
[ 1198.221656] [drm:drm_mode_getconnector] [CONNECTOR:33:?]
[ 1198.221657] [drm:drm_helper_probe_single_connector_modes_merge_bits] [CONNECTOR:33:HDMI-A-3]
[ 1198.221658] [drm:intel_hdmi_detect] [CONNECTOR:33:HDMI-A-3]
[ 1198.246453] [drm:drm_detect_monitor_audio] Monitor has basic audio support
[ 1198.246495] [drm:drm_edid_to_eld] ELD monitor DELL P2815Q
[ 1198.246496] [drm:parse_hdmi_vsdb] HDMI: DVI dual 0, max TMDS clock 300, latency present 0 0, video latency 0 3, audio latency 96 2
[ 1198.246497] [drm:drm_edid_to_eld] ELD size 36, SAD count 1
[ 1198.246525] [drm:drm_helper_probe_single_connector_modes_merge_bits] [CONNECTOR:33:HDMI-A-3] probed modes :
[ 1198.246526] [drm:drm_mode_debug_printmodeline] Modeline 36:"3840x2160" 30 297000 3840 4016 4104 4400 2160 2168 2178 2250 0x48 0x5
[ 1198.246527] [drm:drm_mode_debug_printmodeline] Modeline 90:"3840x2160" 30 296704 3840 4016 4104 4400 2160 2168 2178 2250 0x40 0x5
[ 1198.246529] [drm:drm_mode_debug_printmodeline] Modeline 88:"3840x2160" 25 297000 3840 4896 4984 5280 2160 2168 2178 2250 0x40 0x5
[ 1198.246530] [drm:drm_mode_debug_printmodeline] Modeline 87:"3840x2160" 24 297000 3840 5116 5204 5500 2160 2168 2178 2250 0x40 0x5
[ 1198.246531] [drm:drm_mode_debug_printmodeline] Modeline 105:"3840x2160" 24 296704 3840 5116 5204 5500 2160 2168 2178 2250 0x40 0x5
[ 1198.246532] [drm:drm_mode_debug_printmodeline] Modeline 38:"2560x1440" 60 241500 2560 2608 2640 2720 1440 1443 1448 1481 0x40 0x5
[ 1198.246533] [drm:drm_mode_debug_printmodeline] Modeline 46:"1920x1200" 60 154000 1920 1968 2000 2080 1200 1203 1209 1235 0x40 0x9
[ 1198.246534] [drm:drm_mode_debug_printmodeline] Modeline 37:"1920x1080" 60 148500 1920 2008 2052 2200 1080 1084 1089 1125 0x40 0x5
[ 1198.246536] [drm:drm_mode_debug_printmodeline] Modeline 91:"1920x1080" 60 148352 1920 2008 2052 2200 1080 1084 1089 1125 0x40 0x5
[ 1198.246537] [drm:drm_mode_debug_printmodeline] Modeline 73:"1920x1080i" 60 74250 1920 2008 2052 2200 1080 1084 1094 1125 0x40 0x15
[ 1198.246538] [drm:drm_mode_debug_printmodeline] Modeline 101:"1920x1080i" 60 74176 1920 2008 2052 2200 1080 1084 1094 1125 0x40 0x15
[ 1198.246539] [drm:drm_mode_debug_printmodeline] Modeline 60:"1920x1080" 50 148500 1920 2448 2492 2640 1080 1084 1089 1125 0x40 0x5
[ 1198.246541] [drm:drm_mode_debug_printmodeline] Modeline 72:"1920x1080i" 50 74250 1920 2448 2492 2640 1080 1084 1094 1125 0x40 0x15
[ 1198.246542] [drm:drm_mode_debug_printmodeline] Modeline 86:"1920x1080" 30 74250 1920 2008 2052 2200 1080 1084 1089 1125 0x40 0x5
[ 1198.246543] [drm:drm_mode_debug_printmodeline] Modeline 104:"1920x1080" 30 74176 1920 2008 2052 2200 1080 1084 1089 1125 0x40 0x5
[ 1198.246544] [drm:drm_mode_debug_printmodeline] Modeline 85:"1920x1080" 25 74250 1920 2448 2492 2640 1080 1084 1089 1125 0x40 0x5
[ 1198.246545] [drm:drm_mode_debug_printmodeline] Modeline 79:"1920x1080" 24 74250 1920 2558 2602 2750 1080 1084 1089 1125 0x40 0x5
[ 1198.246546] [drm:drm_mode_debug_printmodeline] Modeline 103:"1920x1080" 24 74176 1920 2558 2602 2750 1080 1084 1089 1125 0x40 0x5
[ 1198.246547] [drm:drm_mode_debug_printmodeline] Modeline 44:"1600x1200" 60 162000 1600 1664 1856 2160 1200 1201 1204 1250 0x40 0x5
[ 1198.246549] [drm:drm_mode_debug_printmodeline] Modeline 45:"1680x1050" 60 119000 1680 1728 1760 1840 1050 1053 1059 1080 0x40 0x9
[ 1198.246550] [drm:drm_mode_debug_printmodeline] Modeline 51:"1280x1024" 75 135000 1280 1296 1440 1688 1024 1025 1028 1066 0x40 0x5
[ 1198.246551] [drm:drm_mode_debug_printmodeline] Modeline 43:"1280x1024" 60 108000 1280 1328 1440 1688 1024 1025 1028 1066 0x40 0x5
[ 1198.246552] [drm:drm_mode_debug_printmodeline] Modeline 42:"1280x800" 60 71000 1280 1328 1360 1440 800 803 809 823 0x40 0x9
[ 1198.246553] [drm:drm_mode_debug_printmodeline] Modeline 41:"1152x864" 75 108000 1152 1216 1344 1600 864 865 868 900 0x40 0x5
[ 1198.246555] [drm:drm_mode_debug_printmodeline] Modeline 39:"1280x720" 60 74250 1280 1390 1430 1650 720 725 730 750 0x40 0x5
[ 1198.246556] [drm:drm_mode_debug_printmodeline] Modeline 92:"1280x720" 60 74176 1280 1390 1430 1650 720 725 730 750 0x40 0x5
[ 1198.246557] [drm:drm_mode_debug_printmodeline] Modeline 71:"1280x720" 50 74250 1280 1720 1760 1980 720 725 730 750 0x40 0x5
[ 1198.246558] [drm:drm_mode_debug_printmodeline] Modeline 52:"1024x768" 75 78800 1024 1040 1136 1312 768 769 772 800 0x40 0x5
[ 1198.246559] [drm:drm_mode_debug_printmodeline] Modeline 53:"1024x768" 60 65000 1024 1048 1184 1344 768 771 777 806 0x40 0xa
[ 1198.246560] [drm:drm_mode_debug_printmodeline] Modeline 54:"800x600" 75 49500 800 816 896 1056 600 601 604 625 0x40 0x5
[ 1198.246561] [drm:drm_mode_debug_printmodeline] Modeline 47:"800x600" 60 40000 800 840 968 1056 600 601 605 628 0x40 0x5
[ 1198.246563] [drm:drm_mode_debug_printmodeline] Modeline 74:"720x576" 50 27000 720 732 796 864 576 581 586 625 0x40 0xa
[ 1198.246564] [drm:drm_mode_debug_printmodeline] Modeline 66:"720x576i" 50 13500 720 732 795 864 576 580 586 625 0x40 0x101a
[ 1198.246565] [drm:drm_mode_debug_printmodeline] Modeline 93:"720x480" 60 27027 720 736 798 858 480 489 495 525 0x40 0xa
[ 1198.246566] [drm:drm_mode_debug_printmodeline] Modeline 40:"720x480" 60 27000 720 736 798 858 480 489 495 525 0x40 0xa
[ 1198.246567] [drm:drm_mode_debug_printmodeline] Modeline 99:"720x480i" 60 13513 720 739 801 858 480 488 494 525 0x40 0x101a
[ 1198.246568] [drm:drm_mode_debug_printmodeline] Modeline 65:"720x480i" 60 13500 720 739 801 858 480 488 494 525 0x40 0x101a
[ 1198.246570] [drm:drm_mode_debug_printmodeline] Modeline 48:"640x480" 75 31500 640 656 720 840 480 481 484 500 0x40 0xa
[ 1198.246571] [drm:drm_mode_debug_printmodeline] Modeline 49:"640x480" 60 25200 640 656 752 800 480 490 492 525 0x40 0xa
[ 1198.246572] [drm:drm_mode_debug_printmodeline] Modeline 61:"640x480" 60 25175 640 656 752 800 480 490 492 525 0x40 0xa
[ 1198.246573] [drm:drm_mode_debug_printmodeline] Modeline 50:"720x400" 70 28320 720 738 846 900 400 412 414 449 0x40 0x6
[ 1198.246578] [drm:drm_mode_getconnector] [CONNECTOR:33:?]
[ 1198.246607] [drm:drm_mode_getconnector] [CONNECTOR:19:?]
[ 1198.246608] [drm:drm_helper_probe_single_connector_modes_merge_bits] [CONNECTOR:19:VGA-1]
[ 1198.246608] [drm:intel_crt_detect] [CONNECTOR:19:VGA-1] force=1
[ 1198.246616] [drm:intel_ironlake_crt_detect_hotplug] ironlake hotplug adpa=0xf40000, result 0
[ 1198.246616] [drm:intel_crt_detect] CRT not detected via hotplug
[ 1198.246775] [drm:gmbus_xfer] GMBUS [i915 gmbus dpb] NAK for addr: 0050 r(1)
[ 1198.246776] [drm:drm_do_probe_ddc_edid] drm: skipping non-existent adapter i915 gmbus dpb
[ 1198.246777] [drm:intel_crt_get_edid] CRT GMBUS EDID read failed, retry using GPIO bit-banging
[ 1198.246777] [drm:intel_gmbus_force_bit] enabling bit-banging on i915 gmbus dpb. force bit now 1
[ 1198.247287] [drm:drm_do_probe_ddc_edid] drm: skipping non-existent adapter i915 gmbus dpb
[ 1198.247288] [drm:intel_gmbus_force_bit] disabling bit-banging on i915 gmbus dpb. force bit now 0
[ 1198.247289] [drm:intel_crt_detect_ddc] CRT not detected via DDC:0x50 [no valid EDID found]
[ 1198.247290] [drm:drm_helper_probe_single_connector_modes_merge_bits] [CONNECTOR:19:VGA-1] disconnected
[ 1206.261412] [drm:intel_crtc_cursor_set_obj] cursor off
[ 1206.261601] [drm:add_framebuffer_internal] [FB:63]
[ 1208.127372] [drm:intel_crtc_cursor_set_obj] cursor off

[-- Attachment #3: Type: text/plain, Size: 159 bytes --]

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Re: "EDID checksum is invalid"

[Daniel Vetter]

On Wed, Jan 7, 2015 at 6:51 PM, Linus Torvalds
<torvalds@linux-foundation.org> wrote:
> On Tue, Jan 6, 2015 at 11:32 PM, Daniel Vetter <daniel@ffwll.ch> wrote:
>>
>> Yeah if the edid probe fails userspace will get a hotplug and
>> autodisable the output. With a failsafe X session (just a dumb
>> terminal) we can avoid that to check that dpms on itself would work or
>> whether the edid probe fail here is just indicative of more trouble.
>> Also please boot with drm.debug=0xe, repro and grab dmesg, that might
>> shed some more light on what's failing.
>
> Here is an annotated attachment with the dpms off output witj drm.debug=0xe.
>
> It turns out the real failure case doesn't seem to be when the bad
> EDID happens. See my notes interspersed with the dmesg output.

Yeah some interesting stuff in there, but no idea why your screen is
ragequitting.
- The edid fail is indeed transiet. There's a bunch of hpd flip-flop
and some screaming (looks like crappy hw booting), but eventually the
kernel gets the full edid and mode list when you kick your hdmi
screen. But ofc the kernel doesn't do modeset since that's already
done. Have you tried whether a force full modeset with xrandr
--off/--auto fixes anything?
- There's nothing different for the deep-sleep dpms cycle that fails
to light up on the sink side - no errors from the modeset and no hpd
from the screen.
- But there is a difference on what userspace does: Somehow an
additionl very fast dpms off/on sneaks in when waking things up. Dunno
where that's from, but fickle screens tend to get upset by that. Maybe
try with the UXA backend in xorg.conf (which has a slightly different
dpms handling):

Section "Device"
        Identifier "igd"
        Driver "intel"
        Option "AccelMethod" "UXA"
EndSection

Otherwise I draw a blank. For the record do you know the old/new bios
versions, in case I can get hold of them and get a real changelog?
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch
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