https://bugs.kde.org/show_bug.cgi?id=451066
Bug ID: 451066
Summary: VSync is forced in Plasma Wayland session with
disabled in-game VSync [NVIDIA].
Product: kwin
Version: 5.24.2
Platform: Archlinux Packages
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: wayland-generic
Assignee: kwin-bugs-n...@kde.org
Reporter: samping...@gmail.com
Target Milestone: ---
SUMMARY
When the in-game VSync is disabled, KWin forces VSync but while in GNOME
Wayland session, this doesnt happen.
STEPS TO REPRODUCE
1. Open a Game which has option to disable in-game VSync.
2. Go to settings and disable VSync.
3. Check the FPS using Mangohud or DXVK HUD. The FPS is still capped to display
refresh rate.
OBSERVED RESULT
Here is the video showcasing this VSync forced by KWin and compared to GNOME
Wayland session:- https://www.youtube.com/watch?v=mATihNvCizY . You can clearly
see that the FPS is capped in Plasma Wayland session while its uncapped in
GNOME Wayland session with the same in-game settings (VSync disabled).
EXPECTED RESULT
The FPS should be uncapped like in the GNOME Wayland session when in-game VSync
is disabled.
SOFTWARE/OS VERSIONS
Linux Kernel: 5.16.11
KDE Plasma Version: 5.24.2
KDE Frameworks Version: 5.91
Qt Version: 5.15.2
ADDITIONAL INFORMATION
NVIDIA Proprietary Driver 510.54
YouTube Video showcasing the issue:-
https://www.youtube.com/watch?v=mATihNvCizY
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