[Bug 97119] screen distortion under KDE when running without compositor

[Bug 97119] screen distortion under KDE when running without compositor

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=97119

Michel Dänzer <michel@daenzer.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|Driver/AMDgpu               |Drivers/Gallium/radeonsi
         QA Contact|xorg-team@lists.x.org       |dri-devel@lists.freedesktop
                   |                            |.org
            Product|xorg                        |Mesa
           Assignee|xorg-driver-ati@lists.x.org |dri-devel@lists.freedesktop
                   |                            |.org

--- Comment #5 from Michel Dänzer <michel@daenzer.net> ---
Since it happens with modesetting as well, it's more likely a Mesa issue.

I wonder if this might be a duplicate of bug 97029. Maybe try if setting the
environment variable R600_DEBUG=nodma for the kwin process avoids the problem.

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[Bug 97119] screen distortion under KDE when running without compositor

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=97119

--- Comment #6 from Michel Dänzer <michel@daenzer.net> ---
Actually, it's better to set the environment variable for the Xorg process as
well, since that might perform the corrupted rendering.

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[Bug 97119] screen distortion under KDE when running without compositor

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=97119

--- Comment #7 from Johannes Hirte <johannes.hirte@datenkhaos.de> ---
(In reply to Michel Dänzer from comment #5)
> Since it happens with modesetting as well, it's more likely a Mesa issue.
> 
> I wonder if this might be a duplicate of bug 97029. Maybe try if setting the
> environment variable R600_DEBUG=nodma for the kwin process avoids the
> problem.

Yes, seems this fixes the distortions as well as the flickering. I've set
R600_DEBUG globally, so kwin and Xorg are affected both.

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[Bug 97119] screen distortion under KDE when running without compositor

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=97119

Michel Dänzer <michel@daenzer.net> changed:

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

--- Comment #8 from Michel Dänzer <michel@daenzer.net> ---


*** This bug has been marked as a duplicate of bug 97029 ***

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[Bug 97119] screen distortion under KDE when running without compositor

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https://bugs.freedesktop.org/show_bug.cgi?id=97119

Johannes Hirte <johannes.hirte@datenkhaos.de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |REOPENED
         Resolution|DUPLICATE                   |---

--- Comment #9 from Johannes Hirte <johannes.hirte@datenkhaos.de> ---
Reopening for tracking flickering separately from 97029.

Flickering is happening mostly with amdgpu driver. Sometimes I've observed this
with modesetting too, but I can't trigger it reliable with this driver.

With amdgpu I can trigger this easily by starting a video with mpv and putting
it into fullscreen. Ending the video or the fullscreen mode causes the
flickering around newly created windows. I'll add a screencast how this look
like.

The flickering can be stopped by starting again a video in fullscreen. As long
as the video is on one virtual desktop, everything works like expected. It
doesn't matter if xv, opengl, vdpau or vaapi output is used.

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[Bug 97119] screen distortion under KDE when running without compositor

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https://bugs.freedesktop.org/show_bug.cgi?id=97119

--- Comment #10 from Johannes Hirte <johannes.hirte@datenkhaos.de> ---
Created attachment 126033
  --> https://bugs.freedesktop.org/attachment.cgi?id=126033&action=edit
screencast with flickering

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[Bug 97119] screen distortion under KDE when running without compositor

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https://bugs.freedesktop.org/show_bug.cgi?id=97119

--- Comment #11 from Johannes Hirte <johannes.hirte@datenkhaos.de> ---
It seems the flickering is related to the repaint rate of the screen. With
video playback it's more heavy than by typing some text. The faster the typing
is, the heavier the flickering becomes.

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[Bug 97119] screen distortion under KDE when running without compositor

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=97119

--- Comment #12 from network723@rkmail.ru ---
The video resembles kwin bug: https://bugs.kde.org/show_bug.cgi?id=361154 which
was fixed in plasma 5.7.4.

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[Bug 97119] screen distortion under KDE when running without compositor

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=97119

--- Comment #13 from Johannes Hirte <johannes.hirte@datenkhaos.de> ---
(In reply to network723 from comment #12)
> The video resembles kwin bug: https://bugs.kde.org/show_bug.cgi?id=361154
> which was fixed in plasma 5.7.4.

I'm running plasma 5.7.4 here and still have the problem. Additionally it's
only affecting amdgpu systems like Carrizo. I don't see this on a Sumo system
(radeon/r600). Tomorrow I can try if I can trigger this on Kabini too.

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[Bug 97119] screen flickerin under KDE when compositor was dis- and reenabled

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=97119

Johannes Hirte <johannes.hirte@datenkhaos.de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|screen distortion under KDE |screen flickerin under KDE
                   |when running without        |when compositor was dis-
                   |compositor                  |and reenabled

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[Bug 97119] screen flickerin under KDE when compositor was dis- and reenabled

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https://bugs.freedesktop.org/show_bug.cgi?id=97119

--- Comment #14 from Michel Dänzer <michel@daenzer.net> ---
Which 'Tearing prevention ("vsync")' mode are you using in the kwin compositor
settings? Maybe attach a screenshot of that settings page.

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[Bug 97119] screen flickerin under KDE when compositor was dis- and reenabled

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https://bugs.freedesktop.org/show_bug.cgi?id=97119

--- Comment #15 from Johannes Hirte <johannes.hirte@datenkhaos.de> ---
(In reply to Michel Dänzer from comment #14)
> Which 'Tearing prevention ("vsync")' mode are you using in the kwin
> compositor settings? Maybe attach a screenshot of that settings page.

Was "Automatic" , but test with "Never" shows the same behavior. I've suspected
glamor to be related here, but a test on Sumo with AccelMethod glamor doesn't
reproduce the error.

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[Bug 97119] screen flickerin under KDE when compositor was dis- and reenabled

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https://bugs.freedesktop.org/show_bug.cgi?id=97119

--- Comment #16 from Christoph Haag <haagch@frickel.club> ---
I've seen similar flickering with kwin 5.7.4 from archlinux:
https://www.youtube.com/watch?v=EnzI7dmjihI

With latest kwin git it does not happen anymore. So if anyone wants to try it
an confirm whether kwin git fixes it: you only need kwayland git, the rest of
kde plasma can stay on the latest release version.

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[Bug 97119] screen flickerin under KDE when compositor was dis- and reenabled

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=97119

--- Comment #17 from Johannes Hirte <johannes.hirte@datenkhaos.de> ---
Flickering seems to be gone for me too, but I didn't update kwin or related.
The parts I've updated last weekend:

llvm
drm
mesa
xf86-video-amdgpu

I have some distortions in the top frame of the window (screenshot of chromium
appended). I will test an update of kwin, if it will fix this.

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[Bug 97119] screen flickerin under KDE when compositor was dis- and reenabled

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=97119

--- Comment #18 from Johannes Hirte <johannes.hirte@datenkhaos.de> ---
Created attachment 126230
  --> https://bugs.freedesktop.org/attachment.cgi?id=126230&action=edit
distortion in window after leaving fullscreen in mpv

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[Bug 97119] screen flickerin under KDE when compositor was dis- and reenabled

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=97119

--- Comment #19 from Christoph Haag <haagch@frickel.club> ---
Discard that. It still happens with kwin git.

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[Bug 97119] screen flickerin under KDE when compositor was dis- and reenabled

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https://bugs.freedesktop.org/show_bug.cgi?id=97119

--- Comment #20 from Johannes Hirte <johannes.hirte@datenkhaos.de> ---
(In reply to Johannes Hirte from comment #17)
> Flickering seems to be gone for me too, but I didn't update kwin or related.
> The parts I've updated last weekend:
>

No it isn't. The one time I've thought it was gone, it was restricted to the
title bar, where the distortions happened. After reboot it's back as before.

I've tested on a Kabini system, cause I thought it's using amdgpu too. But I
was wrong, it's only using radeonsi from mesa. On kernel and ddx side it's
still the radeon driver. I will update everything to current git and re-test
with amdgpu.

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[Bug 97119] screen flickerin under KDE when compositor was dis- and reenabled

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https://bugs.freedesktop.org/show_bug.cgi?id=97119

--- Comment #21 from network723@rkmail.ru ---
This also happens with intel gpu, but no flickering, black areas stand still,
until something causes update of that part of the screen.

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[Bug 97119] screen flickerin under KDE when compositor was dis- and reenabled

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https://bugs.freedesktop.org/show_bug.cgi?id=97119

GitLab Migration User <gitlab-migration@fdo.invalid> changed:

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

--- Comment #22 from GitLab Migration User <gitlab-migration@fdo.invalid> ---
-- 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/mesa/mesa/issues/1236.

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