https://bugs.kde.org/show_bug.cgi?id=482611
Bug ID: 482611
Summary: kwin spikes CPU usage every few minutes, causing major
lag after update to Plasma 6.0.0
Classification: Plasma
Product: kwin
Version: 6.0.0
Platform: Neon
OS: Linux
Status: REPORTED
Severity: major
Priority: NOR
Component: general
Assignee: kwin-bugs-n...@kde.org
Reporter: anon.imm...@gmail.com
Target Milestone: ---
Created attachment 166523
--> https://bugs.kde.org/attachment.cgi?id=166523&action=edit
CPU usage in htop
SUMMARY
***
/usr/bin/kwin_x11 --replace uses 20%25% CPU
/usr/lib/xorg/Xorg -nolisten tcp -background none -seat seat0 vt2 -auth
/run/sddm/xauth_vxVEuW
uses 15-20% CPU
All the time with just Brave browsed, Telegram, and Slack running. Every 2
minutes or so, keyboard and mouse input display stops being processed for
several seconds. Keystrokes are not lost: if you type while the input stops
displaying, everything you typed eventually appears. The mouse pointer can move
during that period, but clicks are not processed and the pointer shape does not
change to e.g. grab or arrow or caret when hovering over elements that would
cause it to change normally. This makes the computer mostly unusable.
This happens in Wayland and x sessions and did not happen before 6.0.0.
***
STEPS TO REPRODUCE
1. Update an up to date KDE Neon User distro to Plasma 6.0.0 using pkcon
update.
2. Use the computer.
OBSERVED RESULT
Two kwin binaries spike the CPU and cause input update lags.
EXPECTED RESULT
CPU usage does not spike and input does not lag.
SOFTWARE/OS VERSIONS
Operating System: KDE neon 6.0
KDE Plasma Version: 6.0.0
KDE Frameworks Version: 6.0.0
Qt Version: 6.6.2
Kernel Version: 6.5.0-21-generic (64-bit)
Graphics Platform: X11
Processors: 8 × Intel® Core™ i7-10510U CPU @ 1.80GHz
Memory: 46.7 GiB of RAM
Graphics Processor: Mesa Intel® UHD Graphics
Manufacturer: LENOVO
Product Name: 20RYS0M100
System Version: ThinkPad T490
ADDITIONAL INFORMATION
This did not happen before Plasma 6.0.0.
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