https://bugs.kde.org/show_bug.cgi?id=467284
Bug ID: 467284
Summary: plasmashell - Unbound memory leaks and high cpu usage
on deactivation of secondary screen using xrandr
Classification: Plasma
Product: plasmashell
Version: 5.27.2
Platform: Fedora RPMs
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: plasma-b...@kde.org
Reporter: f...@fedy.cz
CC: k...@davidedmundson.co.uk
Target Milestone: 1.0
SUMMARY
It looks like after update to plasma 5.27 the secondary screen activation /
deactivation using xrandr on plasma/X11 stopped working correctly. Symptoms
are:
- plasmashell cpu usage spikes to around 60% - reading from top (normally it
keeps around 6% on my system) .
- it starts gradually leaking memory (got to around 5GB when I noticed it after
few hours of use)
- reactivating the screen using xrandr again seems to fix the issue (at least
the cpu use and memory leak)
- the reactivated screen has no background - it's just black (worked fine on
5.26), It doesn't seem to be running plasmashell either (right click does
nothing)
There is a workaround to deactivate the screen by un-checking the "Enable" from
the "Configure display settings", but
- not sure if it can be bound to a keyboard shortcut
- doesn't remember the orientation of the disabled screen (screen is rotated
90° and needs to be configured again to activate)
- plasma should probably try to play nice with standard X11 tools/utilities
POSSIBLY RELATED TO:
Bug 466362, Bug 465994
STEPS TO REPRODUCE
1. Start up plasma on X11 on a dual screen system
2. run top in terminal to observe plasmashell process
2. Deactivate secondary screen using something similar to:
xrandr --output HDMI1 --auto --output HDMI2 --off
3. observe as the plasmashell process cpu usage spikes and the memory use
starts growing rapidly
further (optional) steps:
4. reactivate second screen using something like:
xrandr --output HDMI1 --auto --output HDMI2 --auto --rotate left --right-of
HDMI1
5. observe that plasmashell cpu usage goes down and memory leaks (hopefully)
stop
6. observe that reactivated screen is just black - no background, but
cursor/windows are rendered ok.
ADDITIONAL NOTES:
- if I disable the screen from "Configure display settings" (disabled by
default) and just activate and deactivate it using the commands above, the cpu
spike / memory leak doesn't seem to be there. I still get a black background
and no plasma shell interactions on it (I.E. right click does nothing).
OBSERVED RESULT
- memory leaks
- cpu spikes
- no background / plasmashell on reactivation
EXPECTED RESULT
- none of the above
SOFTWARE/OS VERSIONS
Operating System: Fedora Linux 37
Linux/KDE Plasma: 5.27.2
KDE Plasma Version: 5.27.2
KDE Frameworks Version: 5.103.0
Qt Version: 5.15.8
ADDITIONAL INFORMATION
Graphics Processor: Mesa Intel® UHD Graphics 605
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