i915 and 1440p display w/ corrupt EDID

i915 and 1440p display w/ corrupt EDID

[Mathias Burén]

Hi all,

I've a 1440p display with a non-sufficient/corrupt EDID. I'm running
3.17.0-997-lowlatency #201409192205 from
http://kernel.ubuntu.com/~kernel-ppa/mainline/drm-intel-next/ and this
intel driver on Ubuntu 12.04 LTS, on a Thinkpad T420:

"Module intel: vendor="X.Org Foundation"
[     9.541] compiled for 1.14.5, module version = 2.99.904
SNA compiled: xserver-xorg-video-intel-lts-saucy
2:2.99.904-0ubuntu2.1~precise1 (Timo Aaltonen <tjaalton@ubuntu.com>)"

When I connect the display to the laptop via the docking station, the
laptop detects that there is a display connected, but there are no
modes available. I can add a mode like this:

xrandr --newmode "2560x1440_60.0" 311.83 2560 2744 3024 3488 1440 1441
1444 1490 -HSync +Vsync
xrandr --addmode HDMI3 2560x1440_60.0

But I get an error when trying to use it: "xrandr: Configure crtc 1 failed".

Does anyone have any tips on how to get the monitor working?

Regards
Mathias

Re: i915 and 1440p display w/ corrupt EDID

[Jani Nikula]

On Wed, 24 Sep 2014, Mathias Burén <mathias.buren@gmail.com> wrote:
> I've a 1440p display with a non-sufficient/corrupt EDID.

Just to double check, you mean the display really is broken in this
regard, *not* that the driver is unable to read the EDID?

Does your monitor have other connections than HDMI? Can you try to see
if they produce a valid EDID? It may be possible to use that EDID for
HDMI using the EDID firmware mechanism.

> When I connect the display to the laptop via the docking station, the
> laptop detects that there is a display connected, but there are no
> modes available. I can add a mode like this:

Have you tried without the dock to reduce the number of failure points?

> xrandr --newmode "2560x1440_60.0" 311.83 2560 2744 3024 3488 1440 1441
> 1444 1490 -HSync +Vsync
> xrandr --addmode HDMI3 2560x1440_60.0
>
> But I get an error when trying to use it: "xrandr: Configure crtc 1 failed".
>
> Does anyone have any tips on how to get the monitor working?

Finally, dmesg with drm.debug=14 from boot to the problem, including the
above attempt with xrandr, might prove useful.

BR,
Jani.


-- 
Jani Nikula, Intel Open Source Technology Center
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Re: i915 and 1440p display w/ corrupt EDID

[Mathias Burén]

On 26 September 2014 08:25, Jani Nikula <jani.nikula@linux.intel.com> wrote:
> On Wed, 24 Sep 2014, Mathias Burén <mathias.buren@gmail.com> wrote:
>> I've a 1440p display with a non-sufficient/corrupt EDID.
>
> Just to double check, you mean the display really is broken in this
> regard, *not* that the driver is unable to read the EDID?

I think the EDID is broken as I got this monitor working with a
specific EDID file:
http://learnitwithme.com/wordpress/wp-content/uploads/2012/05/edid-shimian.bin
taken from this blog post on the subject: http://electron14.com/?p=342

>
> Does your monitor have other connections than HDMI? Can you try to see
> if they produce a valid EDID? It may be possible to use that EDID for
> HDMI using the EDID firmware mechanism.

Sorry no, it only has a dual DVI input, nothing else. (no HDMI)

>
>> When I connect the display to the laptop via the docking station, the
>> laptop detects that there is a display connected, but there are no
>> modes available. I can add a mode like this:
>
> Have you tried without the dock to reduce the number of failure points?

The laptop only has VGA and DP out unfortunately.

>
>> xrandr --newmode "2560x1440_60.0" 311.83 2560 2744 3024 3488 1440 1441
>> 1444 1490 -HSync +Vsync
>> xrandr --addmode HDMI3 2560x1440_60.0
>>
>> But I get an error when trying to use it: "xrandr: Configure crtc 1 failed".
>>
>> Does anyone have any tips on how to get the monitor working?
>
> Finally, dmesg with drm.debug=14 from boot to the problem, including the
> above attempt with xrandr, might prove useful.
>
> BR,
> Jani.
>
>
> --
> Jani Nikula, Intel Open Source Technology Center

Some logs:

cmdline: BOOT_IMAGE=/vmlinuz-3.17.0-997-lowlatency
root=/dev/mapper/vg0-root ro quiet threadirqs fastboot logo.nologo
elevator=deadline drm.debug=14

$ xrandr
xrandr: Output HDMI3 is not disconnected but has no modes
Screen 0: minimum 320 x 200, current 1600 x 900, maximum 32767 x 32767
LVDS1 connected primary 1600x900+0+0 (normal left inverted right x
axis y axis) 310mm x 174mm
   1600x900       60.0*+
   1440x900       59.9
   1360x768       59.8     60.0
   1152x864       60.0
   1024x768       60.0
   800x600        60.3     56.2
   640x480        59.9
VGA1 disconnected (normal left inverted right x axis y axis)
HDMI1 disconnected (normal left inverted right x axis y axis)
DP1 disconnected (normal left inverted right x axis y axis)
HDMI2 disconnected (normal left inverted right x axis y axis)
HDMI3 connected (normal left inverted right x axis y axis)
DP2 disconnected (normal left inverted right x axis y axis)
DP3 disconnected (normal left inverted right x axis y axis)
VIRTUAL1 disconnected (normal left inverted right x axis y axis)

dmesg | cat drm: http://pastebin.com/n8GjZNjA

Is there a way I can specify the Intel driver to use another EDID? By
the way, if I connect this display under Windows 7 I would normally
get a BSOD or it's not detected at all.

Regards
Mathias
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Re: i915 and 1440p display w/ corrupt EDID

[Mathias Burén]

On 27 September 2014 16:39, Mathias Burén <mathias.buren@gmail.com> wrote:
> On 26 September 2014 08:25, Jani Nikula <jani.nikula@linux.intel.com> wrote:
>> On Wed, 24 Sep 2014, Mathias Burén <mathias.buren@gmail.com> wrote:
>>> I've a 1440p display with a non-sufficient/corrupt EDID.
>>
>> Just to double check, you mean the display really is broken in this
>> regard, *not* that the driver is unable to read the EDID?
>
> I think the EDID is broken as I got this monitor working with a
> specific EDID file:
> http://learnitwithme.com/wordpress/wp-content/uploads/2012/05/edid-shimian.bin
> taken from this blog post on the subject: http://electron14.com/?p=342
>
>>
>> Does your monitor have other connections than HDMI? Can you try to see
>> if they produce a valid EDID? It may be possible to use that EDID for
>> HDMI using the EDID firmware mechanism.
>
> Sorry no, it only has a dual DVI input, nothing else. (no HDMI)
>
>>
>>> When I connect the display to the laptop via the docking station, the
>>> laptop detects that there is a display connected, but there are no
>>> modes available. I can add a mode like this:
>>
>> Have you tried without the dock to reduce the number of failure points?
>
> The laptop only has VGA and DP out unfortunately.
>
>>
>>> xrandr --newmode "2560x1440_60.0" 311.83 2560 2744 3024 3488 1440 1441
>>> 1444 1490 -HSync +Vsync
>>> xrandr --addmode HDMI3 2560x1440_60.0
>>>
>>> But I get an error when trying to use it: "xrandr: Configure crtc 1 failed".
>>>
>>> Does anyone have any tips on how to get the monitor working?
>>
>> Finally, dmesg with drm.debug=14 from boot to the problem, including the
>> above attempt with xrandr, might prove useful.
>>
>> BR,
>> Jani.
>>
>>
>> --
>> Jani Nikula, Intel Open Source Technology Center
>
> Some logs:
>
> cmdline: BOOT_IMAGE=/vmlinuz-3.17.0-997-lowlatency
> root=/dev/mapper/vg0-root ro quiet threadirqs fastboot logo.nologo
> elevator=deadline drm.debug=14
>
> $ xrandr
> xrandr: Output HDMI3 is not disconnected but has no modes
> Screen 0: minimum 320 x 200, current 1600 x 900, maximum 32767 x 32767
> LVDS1 connected primary 1600x900+0+0 (normal left inverted right x
> axis y axis) 310mm x 174mm
>    1600x900       60.0*+
>    1440x900       59.9
>    1360x768       59.8     60.0
>    1152x864       60.0
>    1024x768       60.0
>    800x600        60.3     56.2
>    640x480        59.9
> VGA1 disconnected (normal left inverted right x axis y axis)
> HDMI1 disconnected (normal left inverted right x axis y axis)
> DP1 disconnected (normal left inverted right x axis y axis)
> HDMI2 disconnected (normal left inverted right x axis y axis)
> HDMI3 connected (normal left inverted right x axis y axis)
> DP2 disconnected (normal left inverted right x axis y axis)
> DP3 disconnected (normal left inverted right x axis y axis)
> VIRTUAL1 disconnected (normal left inverted right x axis y axis)
>
> dmesg | cat drm: http://pastebin.com/n8GjZNjA
>
> Is there a way I can specify the Intel driver to use another EDID? By
> the way, if I connect this display under Windows 7 I would normally
> get a BSOD or it's not detected at all.
>
> Regards
> Mathias

Here's the attempt to use the EDID file via the sysfs interface:
http://pastebin.com/3brap4wB
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