https://bugs.kde.org/show_bug.cgi?id=468146
Bug ID: 468146
Summary: Discrepancy in Game Framerate Perception and Reported
FPS Graphs, VSync magic behaviour.
Classification: Plasma
Product: kwin
Version: 5.27.3
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: wayland-generic
Assignee: kwin-bugs-n...@kde.org
Reporter: edgarssciru...@gmail.com
Target Milestone: ---
STEPS TO REPRODUCE
1. Lunch CSGO on plasma wayland session using xwayland
2. Enter any game
3. Lag
OBSERVED RESULT
Seems like it's very laggy. Gameplay feels like 40-50 fps, meanwhile, the
framerate graph shows 130-140.
EXPECTED RESULT
The expected result is that the gameplay should run smoothly and the framerate
should match or exceed the capabilities of the device or system. In this case,
the discrepancy between the perceived laggy gameplay at 40-50 fps and the
reported framerate graph of 130-140 suggests that there may be an issue
kwin_wayland. No issues on kwin_x11 side
Linux/KDE Plasma: Arch
KDE Plasma Version: 5.27.3
KDE Frameworks Version: 5.104.0
Qt Version: 5.15.8+kde+r185-1
ADDITIONAL INFORMATION
However, when using Gnome Wayland session with Mutter, comp the game actually
feels much smoother with a higher framerate, around 130-140 fps, which is
accurately reflected on the fps graph. On the kwin_wayland side, enabling vysnc
resolves the issue, but it caps the framerate at 60 fps, which may not be
desirable.
I am fully using AMD GPU.
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