https://bugs.kde.org/show_bug.cgi?id=466414
Bug ID: 466414
Summary: Plasmashell and kwin_wayland processes peak in
Wayland, but only when no windows are drawn
Classification: Plasma
Product: plasmashell
Version: 5.27.1
Platform: openSUSE
OS: Linux
Status: REPORTED
Severity: major
Priority: NOR
Component: general
Assignee: plasma-b...@kde.org
Reporter: david.de...@ehu.eus
CC: k...@davidedmundson.co.uk
Target Milestone: 1.0
SUMMARY
***
I have a CPU monitor applet in my panel. In the last couple of days I started
noticing that the bar got filled right after login (as in 100% CPU usage), but
as soon as I opened any window, the bar "emptied" (low CPU usage). However, as
soon as I minimize or close all the windows, the bar gets filled again!
So it's the opposite of what one would expect:
- No windows: high CPU %
- Any window open: low CPU %
In the next comment I'm attaching a video of the described behavior. Note how
the blue bar in the panel grows when there's no windows visible. When I click
the Konsole window with htop running, you can see for one second how the
plasmashell and kwin_wayland processes were peaking, but go back to low %
immediately due to konsole being drawn.
Some other remarks:
- I have confirmed how those two processes get close to 100% by running htop in
a virtual terminal.
- This only happens in Wayland, no such behavior in X11.
- Running "plasmashell --replace" doesn't fix it.
***
Operating System: openSUSE Leap 15.4
KDE Plasma Version: 5.27.1
KDE Frameworks Version: 5.103.0
Qt Version: 5.15.8
Kernel Version: 5.14.21-150400.24.46-default (64-bit)
Graphics Platform: X11
Processors: 4 × Intel® Core™ i7-6600U CPU @ 2.60GHz
Memory: 7.6 GiB of RAM
Graphics Processor: Mesa DRI Intel® HD Graphics 520
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