[Bug 110635] briefly flashing corruption when playing various OGL games

[Bug 110635] briefly flashing corruption when playing various OGL games

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https://bugs.freedesktop.org/show_bug.cgi?id=110635

            Bug ID: 110635
           Summary: briefly flashing corruption when playing various OGL
                    games
           Product: Mesa
           Version: git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/radeonsi
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: tempel.julian@gmail.com
        QA Contact: dri-devel@lists.freedesktop.org

I'm seeing briefly flashing corruption in various OGL games, mostly Dying Light
and Counter-Strike Global Offensive Danger Zone. But I once also saw it in
X-Plane 11.
Happens with Mesa 18 and git and llvm 8 and git, but likely also even older
versions in both cases.

I was able to capture it by recording a video and then extracting an affected
frame:
https://abload.de/img/mpv-shot0001hkjyr.png

Across the aforementioned games, the artifacts look akin or the same. Can also
be brighter squares though.

Hardware issue is unlikely, as radv / amdvlk never show this issue (and Windows
driver neither).

I fail to see a pattern when this corruption occurs, it seems like total chance
to me while gaming.

This is with an RX 580 on Arch.

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[Bug 110635] briefly flashing corruption when playing various OGL games

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https://bugs.freedesktop.org/show_bug.cgi?id=110635

--- Comment #1 from Timothy Arceri <t_arceri@yahoo.com.au> ---
Looks like it might be the same as bug #110575.

Do either of these go away when you run steam with the following:

R600_DEBUG=zerovram steam

Or setting the launch options for the game in steam to:

R600_DEBUG=zerovram %command%

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[Bug 110635] briefly flashing corruption when playing various OGL games

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https://bugs.freedesktop.org/show_bug.cgi?id=110635

--- Comment #2 from tempel.julian@gmail.com ---
The mesa-git build of mine was from after that commit, and a profile already
applies it to Dying Light as well. :)

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[Bug 110635] briefly flashing corruption when playing various OGL games

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https://bugs.freedesktop.org/show_bug.cgi?id=110635

--- Comment #3 from tempel.julian@gmail.com ---
Skyrim in both wined3d and Gallium Nine is affected as well.
How could we start bisecting it? It seems something's broken in Gallium and I'd
really like to have it fixed. :)

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[Bug 110635] briefly flashing corruption when playing various OGL games

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https://bugs.freedesktop.org/show_bug.cgi?id=110635

--- Comment #4 from tempel.julian@gmail.com ---
It looks a lot like it that AMD_DEBUG=nodma prevents the artifacts from
occurring.

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[Bug 110635] briefly flashing corruption when playing various OGL games

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https://bugs.freedesktop.org/show_bug.cgi?id=110635

Danylo <danylo.piliaiev@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |danylo.piliaiev@gmail.com

--- Comment #5 from Danylo <danylo.piliaiev@gmail.com> ---
Yep, AMD_DEBUG=nodma works

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[Bug 110635] briefly flashing corruption when playing various OGL games

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https://bugs.freedesktop.org/show_bug.cgi?id=110635

--- Comment #6 from Andrew Sheldon <asheldon55@gmail.com> ---
I get similar symptoms with Assassins Creed: Unity run under DXVK (with RADV).
The issue doesn't occur with LLVM8, and seems to be a regression in LLVM9 since
it worked fine with the last compile of LLVM9 I used (early May).

The workarounds don't work in my case (nodma, zerovram) so it might be a
separate issue.

Here's a screenshot of the glitch: https://imgur.com/aUgSjW1
See top left for most obvious example of it, although you can see blockiness
across the image.

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[Bug 110635] briefly flashing corruption when playing various OGL games

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https://bugs.freedesktop.org/show_bug.cgi?id=110635

--- Comment #7 from tempel.julian@gmail.com ---
The OGL issue occurs with both LLVM 8 and 9-git, so there might not be a
connection to your radv issue here. I suppose LLVM 9 would also be fine with
AMD_DEBUG=nodma & radeonsi, which indicates that the bug really is in the async
DMA code of radeonsi (or at least triggers it).

I also would suppose that RADV_PERFTEST= doesn't have to know the same values
like AMD_DEBUG=, which afaik applies only to radeonsi.

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[Bug 110635] briefly flashing corruption when playing various OGL games

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https://bugs.freedesktop.org/show_bug.cgi?id=110635

--- Comment #8 from tempel.julian@gmail.com ---
Could we get an update on this?
Apparently AMD_DEBUG=nodma makes the corruption completely disappear, so it
seems the issue really is caused by asynchronous DMA.

If the cause of the issue is not easy to find, perhaps disable async DMA by
default? It doesn't seem to affect performance at all (at least not in wined3d
and Gallium Nine) and it doesn't look like a good idea to me to have corruption
in a vast number of games by default.

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[Bug 110635] briefly flashing corruption when playing various OGL games

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https://bugs.freedesktop.org/show_bug.cgi?id=110635

--- Comment #9 from tempel.julian@gmail.com ---
*bump*
Situation unchanged with recent llvm-git and mesa-git.

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[Bug 110635] briefly flashing corruption when playing various OGL games

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https://bugs.freedesktop.org/show_bug.cgi?id=110635

--- Comment #10 from tempel.julian@gmail.com ---
Bug still present with
mesa-git  19.2.0_devel.112439.11a3679e3ab
llvm-git  9.0.0_r320439.9e8e8c60fa

Is GFX8 not receiving any fixes anymore?

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https://bugs.freedesktop.org/show_bug.cgi?id=110635

--- Comment #11 from Marek Olšák <maraeo@gmail.com> ---
I plan to disable SDMA image copies by default in dGPUs.

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[Bug 110635] briefly flashing corruption when playing various OGL games

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https://bugs.freedesktop.org/show_bug.cgi?id=110635

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

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

--- Comment #12 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/1399.

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