https://bugs.kde.org/show_bug.cgi?id=522075
Bug ID: 522075
Summary: High CPU usage with atomic modesetting.
Classification: Plasma
Product: kwin
Version First 6.7.1
Reported In:
Platform: Arch Linux
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: wayland-generic
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
DESCRIPTION
After upgrade to Plasma 6.7 (on Intel graphics), kwin_wayland takes about 5%
CPU on idle (and a lot more when doing trivial tasks like viewing a static web
page with no animations).
STEPS TO REPRODUCE
1. Upgrade to Plasma 6.7
2. Launch KDE normally, and run htop to monitor usage.
OBSERVED RESULT
kwin_wayland takes high CPU usage even when idle.
EXPECTED RESULT
Low CPU usage when idle.
SOFTWARE/OS VERSIONS
Operating System: Arch Linux
KDE Plasma Version: 6.7.1
KDE Frameworks Version: 6.27.0
Qt Version: 6.11.1
Kernel Version: 6.18.36-1-lts (64-bit)
Graphics Platform: Wayland
Processors: 6 × Intel® Core™ i5-9600K CPU @ 3.70GHz
Memory: 16 GiB of RAM (15.3 GiB usable)
Graphics Processor: Mesa Intel® UHD Graphics 630
ADDITIONAL INFORMATION
If I set the variables `KWIN_DRM_USE_MODIFIERS=0` and `KWIN_DRM_NO_ATOMIC=1`
before starting KDE, then the CPU usage drops to about 1/1.5% on idle, and
stays below 10% when doing trivial tasks.
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