https://bugs.kde.org/show_bug.cgi?id=433664
Bug ID: 433664
Summary: Desktop becomes really slow after disabling and
enabling the kwin compositor again (After 5.21 Update)
Product: kwin
Version: 5.21.1
Platform: Neon Packages
OS: Linux
Status: REPORTED
Severity: major
Priority: NOR
Component: compositing
Assignee: kwin-bugs-n...@kde.org
Reporter: mateush.honor...@gmail.com
Target Milestone: ---
Created attachment 136197
--> https://bugs.kde.org/attachment.cgi?id=136197&action=edit
output of 'qdbus org.kde.KWin /KWin supportInformation'
SUMMARY
After disabling and enabling the compositor, or restarting kwin with kwin_x11
--replace, the desktop becomes very slow, with like 1-2 fps, and becomes pretty
much unusable. The only solution is to logout and login again. This started
happening after the Plasma 5.21 update.
STEPS TO REPRODUCE
1. Restarting kwin or disabling and enabling the compositor in system settings
OBSERVED RESULT
Every window or plasmashell itself is stuttering, slow, just the mouse pointer
is moving fine with normal framerate, the windows become slow and everything
gets really slow.
EXPECTED RESULT
Normal behavior of the desktop.
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: KDE neon 5.21.1
KDE Plasma Version: 5.21.1
KDE Frameworks Version: 5.79.0
Qt Version: 5.15.2
ADDITIONAL INFORMATION
Graphics platform: X11 (In the wayland session, everything seems fine)
Kernel Version: 5.4.0-66-generic
OS Type: 64-bit
Processors: 4 × Intel® Core™ i5-3230M CPU @ 2.60GHz
Memory: 7,7 GiB of RAM
Graphics Processor: Mesa DRI Intel® HD Graphics 4000
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