[Bug 111261] Screen remains black when 2 monitors are connected

[Bug 111261] Screen remains black when 2 monitors are connected

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=111261

            Bug ID: 111261
           Summary: Screen remains black when 2 monitors are connected
           Product: DRI
           Version: DRI git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/AMDgpu-pro
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: fabstz-it@yahoo.fr

With 2 monitors (one on VGA, one on DVI-D), screen turns black while loading
system in console
When only 1 monitor connected to VGA everything is fine.

There is no problem with kernel 5.2 or with amdpgu-dkms 19.10 on debian buster
(linux 4.19)

It happens only with amdpgu-dkms 19.20 or 19.30 (on debian buster - kernel
4.19)
For 19.20 I applied my patch from
https://bugs.freedesktop.org/show_bug.cgi?id=111103, which is merely the same
as the code in 19.30

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[Bug 111261] Screen remains black when 2 monitors are connected

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https://bugs.freedesktop.org/show_bug.cgi?id=111261

--- Comment #1 from Fab Stz <fabstz-it@yahoo.fr> ---
Bug still present in amdgpu-pro-19.30-855429-ubuntu-18.04

Last working version is amdgpu-pro-19.10-785425-ubuntu-18.04

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[Bug 111261] Screen remains black when 2 monitors are connected

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https://bugs.freedesktop.org/show_bug.cgi?id=111261

--- Comment #2 from Alex Deucher <alexdeucher@gmail.com> ---
Please attach your xorg log (if using X) and your dmesg output.  What GPU are
you using?

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[Bug 111261] Screen remains black when 2 monitors are connected

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https://bugs.freedesktop.org/show_bug.cgi?id=111261

--- Comment #3 from Fab Stz <fabstz-it@yahoo.fr> ---
Thanks for your interest in that issue.

How could I do that with nothing visible on my monitors ? Is there any
parameter I can add to the kernel to keep a log ?

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[Bug 111261] Screen remains black when 2 monitors are connected

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https://bugs.freedesktop.org/show_bug.cgi?id=111261

--- Comment #4 from Fab Stz <fabstz-it@yahoo.fr> ---
Created attachment 145098
  --> https://bugs.freedesktop.org/attachment.cgi?id=145098&action=edit
System information (part1)

Please find attached:
- basic configuration details.
- addition information

As instructed here :
https://amdgpu-install.readthedocs.io/en/latest/install-bugrep.html

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[Bug 111261] Screen remains black when 2 monitors are connected

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=111261

--- Comment #5 from Fab Stz <fabstz-it@yahoo.fr> ---
Created attachment 145101
  --> https://bugs.freedesktop.org/attachment.cgi?id=145101&action=edit
System information (part2 = logs)

I could get the logs/info through SSH
There was no Xorg.log probably because the system didn't start X

There is no dedicated GPU on my system but an APU/CPU with integrated graphics
: 
"AMD Athlon 200GE with vega graphics"

BTW, running kernel 5.2.x was fine (both monitors had something displayed)

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[Bug 111261] Screen remains black when 2 monitors are connected

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https://bugs.freedesktop.org/show_bug.cgi?id=111261

--- Comment #6 from Fab Stz <fabstz-it@yahoo.fr> ---
The issue seems to be related to these calls in file
amdgpu-19.30-855429/amd/display/amdgpu_dm/amdgpu_dm.c

twice:
kcl_drm_dp_cec_unset_edid(&aconnector->dm_dp_aux.aux);

once:
kcl_drm_dp_cec_set_edid(&aconnector->dm_dp_aux.aux,
                                            aconnector->edid);

If I delete them the display works also with 19.30

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[Bug 111261] Screen remains black when 2 monitors are connected

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https://bugs.freedesktop.org/show_bug.cgi?id=111261

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

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

--- Comment #7 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/36.

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