https://bugs.kde.org/show_bug.cgi?id=498627
Bug ID: 498627
Summary: Huge kwin_wayland memory leak
Classification: Plasma
Product: kwin
Version: 6.2.5
Platform: Arch Linux
OS: Linux
Status: REPORTED
Severity: major
Priority: NOR
Component: wayland-generic
Assignee: kwin-bugs-n...@kde.org
Reporter: bumblebeepllxd...@gmail.com
Target Milestone: ---
SUMMARY
When using an external monitor on a dual gpu laptop (iGPU + dGPU) a process
kwin_wayland uses huge amounts of memory. The speed of its rise seems to depend
on how many pixels were changed. It rises significantly faster when gaming or
playing a video and nearly doesn't when just displaying the wallpaper. It
usually goes to 8-11GB after an hour. I haven't noticed it going above 11GB
even after 3 hours.
STEPS TO REPRODUCE
1. Pick a laptop with a dGPU
2. Connect an external monitor
3. Use the laptop for a bit
OBSERVED RESULT
Kwin using a lot of memory
EXPECTED RESULT
Kwin not using a lot of memory
SOFTWARE/OS VERSIONS
Linux: 6.12.9-arch1-1
KDE Plasma Version: 6.2.5
KDE Frameworks Version: 6.10.0
Qt Version: 6.8.1
ADDITIONAL INFORMATION
Laptop: Lenovo Legion 16irh8
Cpu: Intel Core i5 13500h
Gpu: Nvidia RTX 4050 Mobile
Ram: 16GB
It doesn't happen when an external monitor is not connected, when the iGPU is
turned off in the bios and when nvidia drivers are not installed.
Disconnecting the monitor while working stops the rise but it stays at the same
level. Connecting it back restarts plasma and resets kwin_wayland's memory
usage but it goes back even faster than it did the first time.
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