https://bugs.kde.org/show_bug.cgi?id=522005
Bug ID: 522005
Summary: UI hangs after starting GW2 via Steam Proton with kwin
and drkonqi 6.7
Classification: Plasma
Product: kwin
Version First 6.7.0
Reported In:
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: wayland-generic
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
Created attachment 193544
--> https://bugs.kde.org/attachment.cgi?id=193544&action=edit
Logs from two sessions, the 1st part of the file is the session without a hang,
the 2nd part has the hang.
DESCRIPTION
When I launch the game Guild Wars 2 via Steam Proton 9.0-4 (same for 8), its
launcher comes up and then I cannot interact with my system anymore.
OBSERVED RESULT
My system hangs, I cannot start another session via e.g. Ctrl+Alt+F3 to check
what is going on. I can only reboot via the PCs power button.
EXPECTED RESULT
No hang.
SOFTWARE/OS VERSIONS
Operating System (available in the Info Center app, or by running `kinfo` in a
terminal window):
Operating System: Arch Linux
KDE Plasma Version: 6.7.0
KDE Frameworks Version: 6.27.0
Qt Version: 6.11.1
Kernel Version: 7.0.12-arch1-1 (64-bit)
Graphics Platform: Wayland
Processors: 32 × AMD Ryzen 9 5950X 16-Core Processor
Memory: 32 GiB of RAM (31.2 GiB usable)
Graphics Processor: AMD Radeon RX 6900 XT
ADDITIONAL INFORMATION
My system is up-to-date, aside from these 2 downgrades:
pacman -U /var/cache/pacman/pkg/kwin-6.6.5-4-x86_64.pkg.tar.zst
/var/cache/pacman/pkg/drkonqi-6.6.5-2-x86_64.pkg.tar.zst
As per https://community.kde.org/KWin/Debugging, I've added this to my
~/.zshrc:
export QT_LOGGING_RULES="kwin_*.debug=true"
Logs from a not hanging and hanging sessions are attached as one file
Looking at these entries in the logs of the hanging session (not seen in the
not hanging session):
kwin_wayland[1221]: Could not create udmabuf: Invalid argument
And this blog post:
https://zamundaaa.github.io/wayland/2026/05/06/making-wl-shm-fast.html
Maybe its related to this feature.
Is there a way to disable it for now?
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