https://bugs.kde.org/show_bug.cgi?id=467318
Bug ID: 467318
Summary: kwin_wayland high cpu usage when docked
Classification: Plasma
Product: kwin
Version: 5.27.2
Platform: Fedora RPMs
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: wayland-generic
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
Created attachment 157261
--> https://bugs.kde.org/attachment.cgi?id=157261&action=edit
Archived perf data
I am running Plasma 5.27.2 on a Fedora machine with hybrid intel/nvidia
graphics.
Sytem: Lenovo P1 with a RTX A2000
When docking the laptop via USB-C or Thunderbolt to one or multiple external
monitors kwin_wayland is constantly above 50% CPU usage. As soon as i move the
mouse or do a user input kwin_wayland occupies one CPU with nearly 100% usage
and the system gets extremely laggy.
STEPS TO REPRODUCE
1. Attach laptop to dock via USB-C or Thunderbolt
2. Move mouse, window or keyboard inpt
OBSERVED RESULT
100% CPU usage on kwin_wayland, laggy Plasma
EXPECTED RESULT
Non laggy Plasma
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Fedora Linux 37 (KDE Spin)
(available in About System)
KDE Plasma Version: 5.27.2
KDE Frameworks Version: 5.103.0
Qt Version: 5.15.8
Kernel Version: 6.1.15-200.fc37.x86_64
I have run:
sudo perf record --call-graph dwarf -p `pidof kwin_wayland`
as suggested in another post.
Seems like "__memmove_avx_unaligned_erms" seems to be the part where the high
load is generated.
I have attached the archived perf.data file, which was created with 'perf
archive'.
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