https://bugs.kde.org/show_bug.cgi?id=492051
Bug ID: 492051
Summary: GPU underutilization on Star Citizen (vulkan)
Classification: Plasma
Product: kwin
Version: git master
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: performance
Assignee: kwin-bugs-n...@kde.org
Reporter: w.iron.zom...@gmail.com
Target Milestone: ---
SUMMARY
When running star citizen with its vulkan backend on kde with wayland, the
framerate varies from 50 to ~70, despite vsync being disabled, and putting the
game in fullscreen mode doesn't fix it.
Xwayland is most likely not the culprit as I remember trying wine's wayland
backend a while ago and running into the same problem.
As seen in the .gif attachment, there is no such issue on x11, and according to
a few other people in the SC linux community it doesn't happen on other desktop
environments or window managers.
STEPS TO REPRODUCE
1. Launch star citizen with wine-staging
2. Set backend to vulkan
3. Restart
4. Join an offline arena commander free flight server for testing
4. Observe
OBSERVED RESULT
The GPU is underutilized and never gets past 75% no matter what
EXPECTED RESULT
Full GPU usage like on x11
SOFTWARE/OS VERSIONS
Linux: Gentoo 2.15 / Kernel 6.10.6
KDE Plasma Version: master
KDE Frameworks Version: master
Qt Version: 6.7.2
Wine: staging 9.15 with ntsync patch
ADDITIONAL INFORMATION
Also happens on stable KDE
Output of "qdbus6 org.kde.KWin /KWin supportInformation":
https://invent.kde.org/-/snippets/3207
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