[Bug 94903] Tahiti and Hawaii (without amdgpu support) skips vblanks on wayland (weston and others) on some displays.

[Bug 94903] Tahiti and Hawaii (without amdgpu support) skips vblanks on wayland (weston and others) on some displays.

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=94903

            Bug ID: 94903
           Summary: Tahiti and Hawaii (without amdgpu support) skips
                    vblanks on wayland (weston and others) on some
                    displays.
           Product: Mesa
           Version: git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: Drivers/Gallium/radeonsi
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: johngaltfirstrun@gmail.com
        QA Contact: dri-devel@lists.freedesktop.org

When running weston on this hardware with Shimian QHD270 displays, vblanks are
skipped resulting in stuttering video playback on any framerate other than
60fps (with multiple players and vo including opengl and wayland (shm)).
System:
Mesa: git
linux: 4.4, 4.5, 4.6 from a drm-next-wip branch
wayland: git
weston: git

A few notes:
 - This doesn't occur when using amdgpu (for instance building with hawaii
amdgpu support.
 - This bug goes back as far as a year, and another user verified they had this
issue on a radeonsi card with a specific monitor.
 - When utilizing amdgpu, the EDID is correctly read from these monitors.
Without, the EDID read fails. I've written the EDID to a file in /lib/firmware/
and successfully loaded with no change however.
 - Outside of video playback, there are no vblank skips. It was explained that
each application affects the entire compositor.
 - No change on video size. The issue is apparent (with no discernible change)
on non-60fps 360p youtube videos on up to high bitrate x265 4K tv shows.
 - By increasing repaint-window, I'm able to get consistent playback and no
vblank skips. However I do run into other issues with it, showing it's clearly
not a real solution for wayland support on radeon.
 - During video playback, weston-presentation-shm shows the missing vblanks
just as a timeline does (so including weston-presentation-shm log for
readability instead).

weston-presentation-shm log with video playback at beginning:
https://bpaste.net/show/f8c9b910ddc1. When vblanks are no longer skipped, the
video playback has stopped.

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[Bug 94903] Tahiti and Hawaii (without amdgpu support) skips vblanks on wayland (weston and others) on some displays.

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=94903

--- Comment #1 from Michel Dänzer <michel@daenzer.net> ---
Please write 63 to /sys/module/drm/parameters/debug before reproducing the
problem and 0 again afterwards, then attach the dmesg output generated in
between.

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[Bug 94903] Tahiti and Hawaii (without amdgpu support) skips vblanks on wayland (weston and others) on some displays.

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=94903

--- Comment #2 from John Galt <johngaltfirstrun@gmail.com> ---
Created attachment 122877
  --> https://bugs.freedesktop.org/attachment.cgi?id=122877&action=edit
Dmesg of video playback with skipped vblanks with
/sys/module/drm/parameters/debug set to 63 then 0 afterward.

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[Bug 94903] Tahiti and Hawaii (without amdgpu support) skips vblanks on wayland (weston and others) on some displays.

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=94903

--- Comment #3 from John Galt <johngaltfirstrun@gmail.com> ---
I've been able to "fix" the issue for tahiti and hawaii (without amdgpu) by
forcing an even 60.0hz refresh rate on this display. Despite the workaround, I
believe there's still a bug here. So I'm leaving the report open.

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[Bug 94903] Tahiti and Hawaii (without amdgpu support) skips vblanks on wayland (weston and others) on some displays.

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=94903

--- Comment #4 from John Galt <johngaltfirstrun@gmail.com> ---
I noticed something interesting: mpv was getting a reported refresh rate of
60.0hz in weston which is incorrect, actual display refresh rate is 59.951hz
(if I don't force it to 60.0hz as a workaround). In X, it gets the correct
refresh rate.

I was about to override the reported refresh rate to 59.951hz for mpv and play
a video without stutters, and without changing monitor's refresh rate.

weston-presentation-shm is also consistent with no vblank skips during playback
this way (at least with mpv playback). I suspect other applications are also
getting an incorrect reported refresh rate.

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[Bug 94903] Tahiti and Hawaii (without amdgpu support) skips vblanks on wayland (weston and others) on some displays.

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https://bugs.freedesktop.org/show_bug.cgi?id=94903

--- Comment #5 from Michel Dänzer <michel@daenzer.net> ---
(In reply to John Galt from comment #4)
> I was about to override the reported refresh rate to 59.951hz for mpv and
> play a video without stutters, [...]

How exactly did you override it?

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[Bug 94903] Tahiti and Hawaii (without amdgpu support) skips vblanks on wayland (weston and others) on some displays.

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=94903

--- Comment #6 from John Galt <johngaltfirstrun@gmail.com> ---
In mpv I set display-fps to 59.951. But this only fixes mpv. I ended up
creating a custom EDID set to 60.0hz, and loading that at boot to fix other
apps as well (no mpv trickery needed this way either).

If I switch to amdgpu, mpv (and apparently other apps) get the correct refresh
rate (59.951hz), and none of this is needed.

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[Bug 94903] Tahiti and Hawaii (without amdgpu support) skips vblanks on wayland (weston and others) on some displays.

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https://bugs.freedesktop.org/show_bug.cgi?id=94903

Michel Dänzer <michel@daenzer.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Version|git                         |unspecified
          Component|Drivers/Gallium/radeonsi    |DRM/Radeon
         QA Contact|dri-devel@lists.freedesktop |
                   |.org                        |
            Product|Mesa                        |DRI

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[Bug 94903] Tahiti and Hawaii (without amdgpu support) skips vblanks on wayland (weston and others) on some displays.

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https://bugs.freedesktop.org/show_bug.cgi?id=94903

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/706.

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