[Bug 106191] Failure to recognize DisplayPort signal

[Bug 106191] Failure to recognize DisplayPort signal

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=106191

            Bug ID: 106191
           Summary: Failure to recognize DisplayPort signal
           Product: DRI
           Version: DRI git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: DRM/Radeon
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: francois.jacques@gmail.com

Created attachment 139004
  --> https://bugs.freedesktop.org/attachment.cgi?id=139004&action=edit
callstack from DRM/radeon

DRM/radeon fails with in drm_dp_link_rate_to_bw_code 

Driver fails to negotiate video resolution with DP-connected monitor, on any of
4 DP ports. 
Controller can drive monitor at 2048x1080 through HDMI adapter. Straight DP
cable only works in console (low-res)

Disconnecting power cable from monitor for 5 minutes trick doesn't help ;)

Video controller: FirePro v8800 ChipID 0x6888 (see hardware.txt for details, 4
DPs)
DP monitor: Dell U2717DA 
Workstation: HP xw8600
Kernel messages with backtrace: see var_log_messages_excerpt.txt
Max res supported by monitor: 1440p (see Xorg.0.log)

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[Bug 106191] Failure to recognize DisplayPort signal

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https://bugs.freedesktop.org/show_bug.cgi?id=106191

--- Comment #1 from François Jacques <francois.jacques@gmail.com> ---
Created attachment 139005
  --> https://bugs.freedesktop.org/attachment.cgi?id=139005&action=edit
"xrandr --current" with DisplayPort-to-HDMI connected

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[Bug 106191] Failure to recognize DisplayPort signal

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https://bugs.freedesktop.org/show_bug.cgi?id=106191

--- Comment #2 from François Jacques <francois.jacques@gmail.com> ---
Created attachment 139006
  --> https://bugs.freedesktop.org/attachment.cgi?id=139006&action=edit
"lspci -k -vv -b" output (snipped, showing v8800-related stuff only)

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[Bug 106191] Failure to recognize DisplayPort signal

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https://bugs.freedesktop.org/show_bug.cgi?id=106191

--- Comment #3 from François Jacques <francois.jacques@gmail.com> ---
Created attachment 139007
  --> https://bugs.freedesktop.org/attachment.cgi?id=139007&action=edit
Xorg output (shows modelines and mysterious flip queue failed messages)

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[Bug 106191] Failure to recognize DisplayPort signal

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https://bugs.freedesktop.org/show_bug.cgi?id=106191

--- Comment #4 from François Jacques <francois.jacques@gmail.com> ---
Forgot to mention... last but not least:

$ uname --all
Linux xw8600.EDITED 4.16.2-gentoo-xw8600-fj #1 SMP PREEMPT Sat Apr 21 10:20:24
EDT 2018 x86_64 Intel(R) Xeon(R) CPU X5450 @ 3.00GHz GenuineIntel GNU/Linux

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[Bug 106191] Failure to recognize DisplayPort signal

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https://bugs.freedesktop.org/show_bug.cgi?id=106191

--- Comment #5 from François Jacques <francois.jacques@gmail.com> ---
If there's anything else I can provide that would help further diagnosing this
issue, I'll gladly try.

Steps I'm thinking about taking for further experiments, in the meantime:

1) try with latest stable kernel available for my distro 
2) try with liveCD of a commercial distro /w rolling release
3) try with older liveCD /w fglrx driver (perhaps from 2011)

I can change the radeon files to output more data or 'debug' trace too. I would
need minimal guidance for which DEFINE to set prior rebuilding to get that
debug trace.

Thank you very much in advance; I can't understand why this pro beast from 2010
can't drive that monitor through DisplayPort.

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[Bug 106191] Failure to recognize DisplayPort signal

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https://bugs.freedesktop.org/show_bug.cgi?id=106191

François Jacques <francois.jacques@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |have-backtrace

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[Bug 106191] FirePro v8800 Failure to recognize DisplayPort signal

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https://bugs.freedesktop.org/show_bug.cgi?id=106191

François Jacques <francois.jacques@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|Failure to recognize        |FirePro v8800 Failure to
                   |DisplayPort signal          |recognize DisplayPort
                   |                            |signal

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[Bug 106191] FirePro v8800 Failure to recognize DisplayPort signal

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https://bugs.freedesktop.org/show_bug.cgi?id=106191

--- Comment #6 from Alex Deucher <alexdeucher@gmail.com> ---
Please attach your full dmesg output.

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[Bug 106191] FirePro v8800 Failure to recognize DisplayPort signal

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https://bugs.freedesktop.org/show_bug.cgi?id=106191

--- Comment #7 from François Jacques <francois.jacques@gmail.com> ---
Created attachment 139014
  --> https://bugs.freedesktop.org/attachment.cgi?id=139014&action=edit
dmesg with 4.16.2

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[Bug 106191] FirePro v8800 Failure to recognize DisplayPort signal

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https://bugs.freedesktop.org/show_bug.cgi?id=106191

--- Comment #8 from François Jacques <francois.jacques@gmail.com> ---
Thank you so much Alex to help out on this! I'll generate another dmesg dump
with 4.16.3

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[Bug 106191] FirePro v8800 Failure to recognize DisplayPort signal

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=106191

--- Comment #9 from François Jacques <francois.jacques@gmail.com> ---
Created attachment 139017
  --> https://bugs.freedesktop.org/attachment.cgi?id=139017&action=edit
dmesg with 4.16.3

backtrace disappears in 4.16.3, still no image.

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[Bug 106191] FirePro v8800 Failure to recognize DisplayPort signal

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https://bugs.freedesktop.org/show_bug.cgi?id=106191

--- Comment #10 from François Jacques <francois.jacques@gmail.com> ---
Just found out about drm.debug. Would you like me to generate a new dmesg
output? With which drm.debug value?

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[Bug 106191] FirePro v8800 Failure to recognize DisplayPort signal

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https://bugs.freedesktop.org/show_bug.cgi?id=106191

--- Comment #11 from François Jacques <francois.jacques@gmail.com> ---

The bug is caused by having both the audio signal and image simultaneously, it
seems. 

After I added "radeon.audio=0" to the kernel argument list and rebooted, the
video interface and the monitor concluded their signal handshake successfully
(!) and I could switch the monitor to full res and, lo' behol',  a 1440p image
(!!).

For future reference, should anyone have issues, try radeon.audio=0. If you
were relying on the radeon for audio, look for an alternative, or use a
DP-to-HDMI adapter and tolerate the lower resolution until the bug is fixed.

----

Googling on this specific symptom revealed multiple regressions on this matter
before, it could be a new one or it's been lurking for a while. Which means
either:
- tons of dupes in the DRM bugs list wrt radeon and DP /w audio enabled and
users don't know how to disable it.
- all radeon users having switched their audio off
- most radeon users gave up on their DisplayPort or their radeon-based card
altogether (perhaps switching brand in the process, frustration kicking in)
- it's a recent regression and I've been lucky to catch it before the kernel
goes mainstream in major distros.

I'll still provide a dmesg dump, this time with drm.debug=0x06 (0x06 any good?
any prefered value?) by rebooting with audio back on and image gone.

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[Bug 106191] FirePro v8800 Failure to recognize DisplayPort signal

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https://bugs.freedesktop.org/show_bug.cgi?id=106191

--- Comment #12 from François Jacques <francois.jacques@gmail.com> ---
Created attachment 139082
  --> https://bugs.freedesktop.org/attachment.cgi?id=139082&action=edit
dmesg (Linux 4.16.3, drm.debug=0x06, audio enabled)

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[Bug 106191] FirePro v8800 Failure to recognize DisplayPort signal

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https://bugs.freedesktop.org/show_bug.cgi?id=106191

--- Comment #13 from François Jacques <francois.jacques@gmail.com> ---
Created attachment 139083
  --> https://bugs.freedesktop.org/attachment.cgi?id=139083&action=edit
REAL dmesg output (with debug messages)

Last attachment for tonight. This one its not /var/log/messages but really
dmesg output. We can see the debug messages as I disconnected the HDMI cable,
then connected the DP cable (no image, audio enabled), then disconnected and
reconnected the HDMI cable.

Hopefully that will be useful to stabilize DP display with audio.

Interesting bits:
[ 1288.208351] [drm:radeon_process_aux_ch.constprop.2 [radeon]] dp_aux_ch flags
not zero
[ 1288.208354] [drm:drm_dp_dpcd_access] Too many retries, giving up. First
error: -5

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[Bug 106191] FirePro v8800 Failure to recognize DisplayPort signal

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https://bugs.freedesktop.org/show_bug.cgi?id=106191

Martin Peres <martin.peres@free.fr> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |MOVED
             Status|NEW                         |RESOLVED

--- Comment #14 from Martin Peres <martin.peres@free.fr> ---
-- GitLab Migration Automatic Message --

This bug has been migrated to freedesktop.org's GitLab instance and has been
closed from further activity.

You can subscribe and participate further through the new bug through this link
to our GitLab instance: https://gitlab.freedesktop.org/drm/amd/issues/849.

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