https://bugs.kde.org/show_bug.cgi?id=510579
Bug ID: 510579
Summary: [xwayland] VRR not in sync with game FPS
Classification: Plasma
Product: kwin
Version First 6.4.5
Reported In:
Platform: Gentoo Packages
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: xwayland
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
Created attachment 185743
--> https://bugs.kde.org/attachment.cgi?id=185743&action=edit
Overwatch showcase video 1 - KDE
SUMMARY
On Overwatch I could feel that the game isn't smooth and decided to look into
it.
I have a 270Hz QHD monitor, driven by / connected to the iGPU of an 9950X3D
through USB-C, and an 6950XT dGPU that is used when I game.
The monitor supports VRR and has an embedded FPS counters that can be used to
show the VRR FPS it is receiving from the OS. On Overwatch, I realized that the
game's FPS doesn't match with the montor's reported VRR FPS (which is much
lower), and that is the cause of the junky feel to the game.
I have tested the same on Mutter 48.5 and this issue does not happen.
Please see attached 960FPS video captures
SOFTWARE/OS VERSIONS
Operating System: Gentoo Linux 2.18
KDE Plasma Version: 6.4.5
KDE Frameworks Version: 6.18.0
Qt Version: 6.9.3
Kernel Version: 6.17.0-tkg-pds-llvm (64-bit)
Graphics Platform: Wayland
Processors: 32 × AMD Ryzen 9 9950X3D 16-Core Processor
Memory: 64 GiB of RAM (60.5 GiB usable)
Graphics Processor 1: AMD Radeon Graphics
Graphics Processor 2: AMD Radeon RX 6950 XT
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