https://bugs.kde.org/show_bug.cgi?id=510125
Bug ID: 510125
Summary: Unreasonable CPU usage by kwin_wayland while full
screen video playback
Classification: Plasma
Product: kwin
Version First 6.4.5
Reported In:
Platform: Arch Linux
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: performance
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
Created attachment 185426
--> https://bugs.kde.org/attachment.cgi?id=185426&action=edit
top and intel_gpu_top
SUMMARY
Playing a full screen video with Firefox on a 4K display results in > 30% CPU
usage by the kwin_wayland process.
STEPS TO REPRODUCE
1. Run a video playback in Firefox full screen on a 4K monitor
2. Check 'top' on a second monitor
OBSERVED RESULT
'top' shows constant CPU usage of more that 30%
EXPECTED RESULT
CPU usage should not be so high
SOFTWARE/OS VERSIONS
KDE Plasma Version: 6.4.5
KDE Frameworks Version: 6.18.0
Qt Version: 6.9.2
ADDITIONAL INFORMATION
- The CPU is Intel i5-1135G7, I'm using integrated graphic (Mesa Intel Iris Xe
Graphics).
- I asked a friend to test this scenario with SwayFX - he had around 4% CPU
usage by his compositor. Although he has a different platform - desktop with a
dedicated GPU.
- If a youtube video isn't opened in full screen the CPU usage by kwin is
around 6.5%.
- Attaching screenshot with 'top' and 'intel_gpu_top' which I run on the second
screen.
- I wasn't been able to make 'All Screens' screenshot with Spectacle while a
video was playing - the result seems to be corrupted. Probably off topic, but
could be related.
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