[Bug 107082] With 4.18 rc kernel stop working video output on AMD GPU Vega 56

[Bug 107082] With 4.18 rc kernel stop working video output on AMD GPU Vega 56

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=107082

            Bug ID: 107082
           Summary: With 4.18 rc kernel stop working video output on AMD
                    GPU Vega 56
           Product: DRI
           Version: XOrg git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: mikhail.v.gavrilov@gmail.com

- when monitor plugged via display port after boot I see blank screen, but
system react on Ctrl-Alt-Delete and I could connect via ssh and reboot system
by init 6 command.
- when monitor plugged via HDMI was system hang during boot.

More detail provided in downstream report:
https://bugzilla.redhat.com/show_bug.cgi?id=1592110

Also I bisecting kernel for investigating problem:

$ git bisect log
# bad: [4c5e8fc62d6a63065eeae80808c498d1dcfea4f4] Merge tag
'linux-kselftest-4.18-rc1-2' of
git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest
# good: [2837461dbe6f4a9acc0d86f88825888109211c99] Merge tag 'scsi-fixes' of
git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi
git bisect start '4c5e8fc62d6a63065eeae80808c498d1dcfea4f4'
'2837461dbe6f4a9acc0d86f88825888109211c99'
# good: [b5d903c2d656e9bc54bc76554a477d796a63120d] Merge branch 'akpm' (patches
from Andrew)
git bisect good b5d903c2d656e9bc54bc76554a477d796a63120d
# bad: [a0b2ac29415bb44d1c212184c1385a1abe68db5c] drm/amdgpu: fix the missed
vcn fw version report
git bisect bad a0b2ac29415bb44d1c212184c1385a1abe68db5c
# bad: [0b19fdc45feffd7569c081fe32a258df3c8ebb9b] drm/amd/display: fix
dscl_manual_ratio_init
git bisect bad 0b19fdc45feffd7569c081fe32a258df3c8ebb9b
# bad: [4c6530fd66399182d0332c5ed821ea473bdcd7c3] drm/amdgpu: remove
unnecessary scheduler entity for VCN
git bisect bad 4c6530fd66399182d0332c5ed821ea473bdcd7c3
# bad: [10dd2b865393bb45526ca342fe69207341f89fd5] drm/amd/display: Fix wrong
latency assignment for VEGA clock levels
git bisect bad 10dd2b865393bb45526ca342fe69207341f89fd5
# bad: [adea72c5046f7faffff969ece04c3f31e669edf4] drm/amdgpu:
vcn_v1_0_is_idle() can be static
git bisect bad adea72c5046f7faffff969ece04c3f31e669edf4
# bad: [bfdec234047889f4f6af1ec45c7c502a4405b3fb] drm/amd/display: Implement
dm_pp_get_clock_levels_by_type_with_latency
git bisect bad bfdec234047889f4f6af1ec45c7c502a4405b3fb
# first bad commit: [bfdec234047889f4f6af1ec45c7c502a4405b3fb] drm/amd/display:
Implement dm_pp_get_clock_levels_by_type_with_latency

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[Bug 107082] With 4.18 rc kernel stop working video output on AMD GPU Vega 56

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https://bugs.freedesktop.org/show_bug.cgi?id=107082

--- Comment #1 from Nicholas Kazlauskas <nicholas.kazlauskas@amd.com> ---
This should be fixed with: https://patchwork.freedesktop.org/patch/233283/
The fix is also availble if you use amd-staging-drm-next.

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[Bug 107082] With 4.18 rc kernel stop working video output on AMD GPU Vega 56

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https://bugs.freedesktop.org/show_bug.cgi?id=107082

--- Comment #2 from Michel Dänzer <michel@daenzer.net> ---
(In reply to Nicholas Kazlauskas from comment #1)
> This should be fixed with: https://patchwork.freedesktop.org/patch/233283/
> The fix is also availble if you use amd-staging-drm-next.

Since the regression happened in the 4.18 cycle, the fix needs to go to 4.18.

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[Bug 107082] With 4.18 rc kernel stop working video output on AMD GPU Vega 56

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https://bugs.freedesktop.org/show_bug.cgi?id=107082

--- Comment #3 from Harry Wentland <harry.wentland@amd.com> ---
Created attachment 140594
  --> https://bugs.freedesktop.org/attachment.cgi?id=140594&action=edit
[PATCH] drm/amd/display: Convert 10kHz clks from PPLib into kHz for Vega

Don't think the other patch would apply to 4.18 but this one should. There's
been a bunch of work on the powerplay/DC interface, so this looks different for
4.18 and amd-stg.

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[Bug 107082] With 4.18 rc kernel stop working video output on AMD GPU Vega 56

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https://bugs.freedesktop.org/show_bug.cgi?id=107082

--- Comment #4 from mikhail.v.gavrilov@gmail.com ---
(In reply to Harry Wentland from comment #3)
> Created attachment 140594 [details] [review]
> [PATCH] drm/amd/display: Convert 10kHz clks from PPLib into kHz for Vega
> 
> Don't think the other patch would apply to 4.18 but this one should. There's
> been a bunch of work on the powerplay/DC interface, so this looks different
> for 4.18 and amd-stg.

I can confirm that this patch fix the issue.

But I did not like one thing:
I decided to check how work VEGA GPU through HDMI and connected the second
monitor via HDMI.

The first that I did not like was that on the first monitor which was connected
via DisplayPort, the scaling setting was reset from 200% to 100%.

The second that I did not like was that when I tried to set the scaling at 200%
through gnome-settings, my computer was hung. I even could not connect through
ssh to look at the kernel log.

I tried to repeat this case but unsuccessfully, but unpleasant residue still
remained.

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[Bug 107082] With 4.18 rc kernel stop working video output on AMD GPU Vega 56

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https://bugs.freedesktop.org/show_bug.cgi?id=107082

--- Comment #5 from Michel Dänzer <michel@daenzer.net> ---
(In reply to mikhail.v.gavrilov from comment #4)
> The first that I did not like was that on the first monitor which was
> connected via DisplayPort, the scaling setting was reset from 200% to 100%.

Sounds like a GNOME issue. The kernel driver doesn't do any implicit scaling,
it's all up to userspace.

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[Bug 107082] With 4.18 rc kernel stop working video output on AMD GPU Vega 56

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https://bugs.freedesktop.org/show_bug.cgi?id=107082

--- Comment #6 from mikhail.v.gavrilov@gmail.com ---
(In reply to Michel Dänzer from comment #5)
> 
> Sounds like a GNOME issue. The kernel driver doesn't do any implicit
> scaling, it's all up to userspace.

I don't believe that sshd can hang because of gnome-shell bug.

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[Bug 107082] With 4.18 rc kernel stop working video output on AMD GPU Vega 56

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https://bugs.freedesktop.org/show_bug.cgi?id=107082

--- Comment #7 from Michel Dänzer <michel@daenzer.net> ---
(In reply to mikhail.v.gavrilov from comment #6)
> I don't believe that sshd can hang because of gnome-shell bug.

Sure, I'm only talking about the scaling reset.

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[Bug 107082] With 4.18 rc kernel stop working video output on AMD GPU Vega 56

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https://bugs.freedesktop.org/show_bug.cgi?id=107082

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

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

--- Comment #8 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/439.

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