https://bugs.kde.org/show_bug.cgi?id=490876
Bug ID: 490876
Summary: Proton games locked to display's refresh rate with
kwin 6.1.3
Classification: Plasma
Product: kwin
Version: 6.1.3
Platform: Arch Linux
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: xwayland
Assignee: kwin-bugs-n...@kde.org
Reporter: g.igna...@outlook.com
Target Milestone: ---
SUMMARY
DOOM Eternal launches at 330 FPS (v-sync OFF) but gameplay is choppy. After
alt-tabbing and returning to the game, the game gets locked at 165fps (monitor
refresh rate). Monitor is set at 165hz and VRR is set to Adaptive.
STEPS TO REPRODUCE
1. Launch DOOM Eternal
2. Alt-tab / press meta and return to the game
OBSERVED RESULT
Gameplay is choppy
FPS in menu should be a bit higher than 330 (around 350 if all was normal)
Game gets locked to monitor refresh rate after minimizing and maximizing it
EXPECTED RESULT
Smooth gameplay and no locked FPS
SOFTWARE/OS VERSIONS
Linux: Arch KDE Wayland
KDE Plasma Version: 6.1.3
KDE Frameworks Version: 6.4.0
Qt Version: 6.7.2
AMDVLK : NO
Mesa: Mesa 24.2.0-devel (git-17c12a9924) (mesa-minimal-git compiled in a clean
chroot against llvm-minimal-git. This build was used with kwin 6.1.2 with zero
framerate issues!)
Kernel: 6.9/6.10
ADDITIONAL INFORMATION
Restarting the game, steam, system does not fix the problem.
Downgrading kwin to 6.1.2 fallowed by a simple logout and login after the
downgrade fixes the issue. DOOM opens up with high FPS and stays with high FPS.
Actually here is some gameplay with 6.1.2 showing alt-tabbing:
https://www.youtube.com/watch?v=BrqG-6d27_w
Now what is strange is that afterwards kwin can be updated back to 6.1.3 and
the issue will not be immediately there.
I can recreate the cycle of 6.1.3 having locked FPS / choppiness problems >
downgrading to 6.1.2 to fix > upgrading to 6.1.3 with no problems > 6.1.3
starting to have the problems again > repeat
Video showing the problem on 6.1.3:
https://www.youtube.com/watch?v=P3ohvJDBJfc
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