https://bugs.kde.org/show_bug.cgi?id=513295
Bug ID: 513295
Summary: Frame drops when using applications with CPU rendering
Classification: Plasma
Product: kwin
Version First 6.5.4
Reported In:
Platform: Other
OS: Linux
Status: REPORTED
Keywords: efficiency-and-performance, wayland-only
Severity: normal
Priority: NOR
Component: performance
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
When the content of an application without GPU acceleration is updated, the
whole kwin_wayland process will drop frames. It seems that the video output
those applications are copied from CPU to GPU, but this slow operation happens
on the main thread and blocks other things, such as input handling.
STEPS TO REPRODUCE
1. Open dolphin file explorer on a high resolution screen with high refresh
rate 3840x2160 120 Hz or 2560x1440 240 Hz.
2. Move the mouse while selecting files
OBSERVED RESULT
Kwin is dropping frame and using almost 100% of 1 CPU thread
EXPECTED RESULT
Only dolphin should drop frames, not kwin
SOFTWARE/OS VERSIONS
Linux: 6.17.9-arch1-1
KDE Plasma Version: 6.5.4
KDE Frameworks Version: 6.20.0
Qt Version: 6.10.1
ADDITIONAL INFORMATION
I'm using 2560x1440 360Hz and 2560x1440 144Hz monitors
This issue is only observable on Wayland, not on X11
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