[BUG] [PSA] : GPU bug causes crashes on KDE Plasma

Nathaniel_Graham · September 24, 2024, 8:29pm

Hey all,
I’ve been experiencing crashes due to a mesa driver bug on the 7700S. After reaching out to both KDE and mesa, I have gotten a workaround that seems to do the trick. This only occurs if a monitor is plugged in via the USB-C DP alt-mode port on the back of the GPU.

I’ve submitted a bug report with KDE-plasma: 492830 – Fullscreen Games Not Displaying Properly
And they directed me to an existing mesa bug: Atomic Commit Failed when Gaming (#2075) · Issues · drm / amd · GitLab

Here are my symptoms:

extremely low fps or laggy mouse
the visuals will “freeze”, but trying to record the issue with OBS will not actually record the issue. OBS simply sees what I’m supposed to be seeing imgur video
some games (in my case, Timberborn specifically) will actually cause KDE plasma to hang completely. This is because the GPU driver resets, and KDE fails to handle the bug properly

The (temporary/workaround) solutions that I’ve found:

use gamescope. This works around the issue by bypassing the kwin compositor
As of right now, this will make the Steam overlay not work due to an an open Steam bug ^[1], and mangohud will not work properly ^[2]

turn off the Steam Overlay. I haven’t tested this more than a couple of times, but this seems to work. I don’t know if the steam overlay is actually triggering the bug somehow or what.

add KWIN_DRM_NO_DIRECT_SCANOUT=1 to /etc/environment. This is a workaround that AMD-mesa has specifically reported to work. KDE/plasma told me that this would cause a performance hit, but I have not (yet) noticed anything different.

github.com/ValveSoftware/gamescope

Steam Overlay not loading when running steam under gamescope

opened 01:33PM - 12 Jul 24 UTC

blackdragon2447

When running steam under gamescope, even with `-e`, steam does not load the stea…m overlay correctly, resulting in nothing happening when pressing Shift+Tab. Command used to start gamescope: ``` gamescope -W 2256 -H 1504 -w 2256 -h 1504 -r 60 --backend sdl -e --mangoapp -- steam ``` I have also tried not using `--mangoapp` and `--backend sdl`, neither of which result in the overlay working. Relevant log line: ``` ERROR: ld.so: object '/home/blackdragon2447/.local/share/Steam/ubuntu12_32/gameoverlayrenderer.so' from LD_PRELOAD cannot be preloaded (wrong ELF class: ELFCLASS32): ignored. ``` Full relevant log: [console-linux.txt](https://github.com/user-attachments/files/16194748/console-linux.txt)

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github.com/ValveSoftware/gamescope

Mangohud does not come back when pressing R_Shift+F12

opened 05:31PM - 19 Sep 24 UTC

ngraham20

When starting gamescope with `--mangoapp`, the mangohud overlay comes up correct…ly, but if I hide it by pressing `R_Shift+F12`, then I cannot make it come back with the same key command

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jared_kidd · October 9, 2024, 6:21am

I just want to add that the environment variable seemed to have fixed this for me as well. Been searching around for a while until finally coming across the bug report you listed.

Some games seemed to work okay, some would randomly work (Helldivers 2), while others would not work at all (Ghosts of Tsushima). Adding KWIN_DRM_NO_DIRECT_SCANOUT=1 to /etc/environment got them all working.

Insane to think this is at least a 2 year old bug.

Nathaniel_Graham · October 12, 2024, 4:09pm

I’m glad that the solution worked for you! It’s also great knowing I’m not the only one having this issue, since while it was happening, it felt like nobody else was experiencing it

Hopefully a solution comes around soon! It sounds like a couple of those issues might actually trace all the way back to Wayland protocols itself, so maybe Valve’s new proposal for making Wayland a little more bleeding edge will fix it!