https://bugs.kde.org/show_bug.cgi?id=459692
Bug ID: 459692
Summary: [Wayland] kwin_wayland 100% cpu, system lagging, intel
+ nvidia optimus with external monitors
Classification: Plasma
Product: kwin
Version: 5.25.5
Platform: Archlinux
OS: Linux
Status: REPORTED
Severity: major
Priority: NOR
Component: platform-drm
Assignee: kwin-bugs-n...@kde.org
Reporter: jeanniesteven...@protonmail.com
Target Milestone: ---
SUMMARY
Starting a NVIDIA Optimus machine with a monitor plugged into an output
controlled by the NVIDIA card on wayland with kwin causes kwin_wayland to hog
CPU on a single core, leading to very poor graphical performance.
Works fine when no external monitors are plugged in. I've attached my
kwin_wayland log below.
https://pastebin.com/uJkPmC4f is the kwin_wayland log with monitors plugged in
on boot.
https://pastebin.com/WSz7BXXs is the kwin_wayland log without monitors plugged
in, where everything works fine.
STEPS TO REPRODUCE
1. Connect Optimus Laptop with NVIDIA outputs to external monitor
2. Start KDE
OBSERVED RESULT
EXPECTED RESULT
Low CPU usage and responsive desktop
SOFTWARE/OS VERSIONS
Linux/KDE Plasma:
(available in About System)
KDE Plasma Version: 5.25.5
KDE Frameworks Version: 5.98.0
Qt Version: 5.15.6
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