https://bugs.kde.org/show_bug.cgi?id=527601
Bug ID: 527601
Summary: Kwin poor frame pacing
Classification: Plasma
Product: kwin
Version First 6.7.5
Reported In:
Platform: Bazzite
OS: Linux
Status: REPORTED
Severity: major
Priority: NOR
Component: compositing
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
DESCRIPTION
Kwin seems to have really bad framepacing in games, without manual overrides
from gamescope.
Games like The Witcher 3 Remastered, on my hardware, has some weird cadence
when showing the frames. Like its double scanning, or not flipping the buffer
as it should.
The screen might be of relevance here, its a MSI URX321 240HZ 4K Display
STEPS TO REPRODUCE
1. Bazzite install, stock
2. Install and boot Witcher 3 Remastered, no launch options
3. Run the game with no framelimiter, and vsync
OBSERVED RESULT
This is the result I get, its a juddery, jittery mess. Eventhough the frametime
and framerate suggest otherwise.
https://www.youtube.com/watch?v=ub-ZvU1wvA0
EXPECTED RESULT
This is running the game within gamescope, with the following launch options:
gamescope -w 3840 -h 2160 -r 240.0 --mangoapp --fullscreen --adaptive-sync
--immediate-flips -- %command% --launcher-skip
It is still not buttery smooth, but it's a lot better. Suggesting it is not the
game or the engine that is stalling, as all those settings are only impacting
Kwin. And you can observe not frametime spikes in the overlays.
https://www.youtube.com/watch?v=FXJSo_DLhEA
SOFTWARE/OS VERSIONS
Operating System: Bazzite 44
KDE Plasma Version: 6.7.5
KDE Frameworks Version: 6.31.0
Qt Version: 6.11.2
Kernel Version: 7.2.9-ogc3.1.fc44.x86_64 (64-bit)
Graphics Platform: Wayland
Processors: 16 × AMD Ryzen 7 5800X3D 8-Core Processor
Memory: 32 GiB of RAM (31.2 GiB usable)
Graphics Processor: AMD Radeon RX 6800 XT
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