https://bugs.kde.org/show_bug.cgi?id=480885
Bug ID: 480885
Summary: High CPU usage for window under cursor \ plasma shell
(if over desktop) and kwin_wayland when moving mouse
cursor
Classification: Plasma
Product: kwin
Version: master
Platform: Neon
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: kwin-bugs-n...@kde.org
Reporter: feat...@engineer.com
Target Milestone: ---
SUMMARY
When moving the mouse, the CPU usage of the window under the cursor, as well as
kwin_wayland is very high.
STEPS TO REPRODUCE
1. move cursor over a window or over the desktop
OBSERVED RESULT
The CPU usage shoots up (over 30% for kwin_wayland, and another over 25% for
the window under the cursor) on my machine, i.e. more than 50% cpu.
Interestingly, when there's another process which uses 100% cpu, when moving
the cursor kwin_wayland "only" uses 17%, and the window under the cursor "only"
uses 7%.
EXPECTED RESULT
There should be a negligible cpu usage from just moving the mouse cursor around
SOFTWARE/OS VERSIONS
Linux/KDE Plasma:
(available in About System)
KDE Plasma Version: 6.0.80
KDE Frameworks Version: 6.0.0
Qt Version: 6.6.1
ADDITIONAL INFORMATION
System:
Kernel: 6.5.0-15-generic x86_64 bits: 64 compiler: N/A
Desktop: KDE Plasma 6.0.80 Distro: KDE neon 22.04 Unstable Edition
base: Ubuntu 22.04 LTS Jammy
Machine:
Type: Desktop System: Dell product: Precision 3630 Tower v: N/A
serial: <superuser required>
Mobo: Dell model: 0NNNCT v: A01 serial: <superuser required> UEFI: Dell
v: 2.25.0 date: 11/09/2023
CPU:
Info: 6-core model: Intel Core i7-8700 bits: 64 type: MT MCP
arch: Coffee Lake rev: A cache: L1: 384 KiB L2: 1.5 MiB L3: 12 MiB
Speed (MHz): avg: 800 high: 804 min/max: 800/4600 cores: 1: 804 2: 800
3: 800 4: 800 5: 800 6: 800 7: 800 8: 800 9: 800 10: 800 11: 800 12: 800
bogomips: 76799
Flags: avx avx2 ht lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx
Graphics:
Device-1: Intel CoffeeLake-S GT2 [UHD Graphics 630]
vendor: Dell CometLake-S driver: i915 v: kernel bus-ID: 00:02.0
Device-2: NVIDIA GP104 [GeForce GTX 1080] vendor: Dell driver: nouveau
v: kernel bus-ID: 01:00.0
Display: wayland server: X.org v: 1.21.1.4 with: Xwayland v: 23.2.3
compositor: kwin_wayland driver: X: loaded: modesetting
unloaded: fbdev,vesa gpu: i915,nouveau resolution: 1920x1080
OpenGL: renderer: NV134 v: 4.3 Mesa 23.0.4-0ubuntu1~22.04.1
direct render: Yes
Audio:
Device-1: Intel Cannon Lake PCH cAVS vendor: Dell driver: snd_hda_intel
v: kernel bus-ID: 00:1f.3
Device-2: NVIDIA GP104 High Definition Audio vendor: Dell
driver: snd_hda_intel v: kernel bus-ID: 01:00.1
Sound Server-1: ALSA v: k6.5.0-15-generic running: yes
Sound Server-2: PulseAudio v: 15.99.1 running: yes
Sound Server-3: PipeWire v: 0.3.48 running: yes
Network:
Device-1: Intel Ethernet I219-LM vendor: Dell driver: e1000e v: kernel
port: N/A bus-ID: 00:1f.6
IF: eno1 state: up speed: 100 Mbps duplex: full mac: <filter>
RAID:
Hardware-1: Intel SATA Controller [RAID mode] driver: ahci v: 3.0
bus-ID: 00:17.0
Drives:
Local Storage: total: 476.94 GiB used: 0 KiB (0.0%)
ID-1: /dev/sda vendor: Micron model: 1100 SATA 512GB size: 476.94 GiB
Partition:
ID-1: / size: 15.58 GiB used: 338.7 MiB (2.1%) fs: overlay source: ERR-102
Swap:
Alert: No swap data was found.
Sensors:
System Temperatures: cpu: 29.0 C pch: 43.0 C mobo: 29.0 C gpu: nouveau
temp: 39.0 C
Fan Speeds (RPM): cpu: 1561 fan-2: 852 gpu: nouveau fan: 1008
Info:
Processes: 276 Uptime: 2h 38m Memory: 31.17 GiB used: 3.96 GiB (12.7%)
Init: systemd runlevel: 5 Compilers: gcc: 11.4.0 Packages: 2184 Shell: Bash
v: 5.1.16 inxi: 3.3.13
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