https://bugs.kde.org/show_bug.cgi?id=451125
Bug ID: 451125
Summary: Changing kwin related settings when OpenGL renderer is
enabled makes kwin sluggish
Product: kwin
Version: 5.24.2
Platform: Fedora RPMs
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: compositing
Assignee: kwin-bugs-n...@kde.org
Reporter: phoenix_8...@hotmail.com
Target Milestone: ---
SUMMARY
***
It seems that whenever kwin gets replaced to apply some settings, and the
OpenGL renderer is enabled, kwin becomes sluggish and almost unusable. The only
way to fix the issue is either reboot the system, or disable OpenGL via the
OpenGLIsUnsafe setting in .config/kwinrc and then run kwin_x11 --replace (this
of course disables all effects).
***
STEPS TO REPRODUCE
1. Simply run kwin_x11 --replace or just modify some kwin related setting like
window decorations.
OBSERVED RESULT
kwin is restarted but it is now sluggish
EXPECTED RESULT
kwin should restart without problems
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Fedora 35 KDE Edition
(available in About System)
KDE Plasma Version: 5.24.2
KDE Frameworks Version: 5.91.0
Qt Version: 5.15.2
Kernel version: 5.16.11
Video driver: nouveau
GPU: intel/nvidia optimus
ADDITIONAL INFORMATION
I tried disabling nouveau from boot by setting nouveau.modeset=0 as kernel
parameter and thus use only mesa drivers, but the issue remains.
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