https://bugs.kde.org/show_bug.cgi?id=437313
Bug ID: 437313
Summary: High CPU usage and memory leak when switching user in
KDE Plasma with NVIDIA drivers
Product: plasmashell
Version: 5.21.90
Platform: Archlinux Packages
OS: Linux
Status: REPORTED
Severity: crash
Priority: NOR
Component: generic-crash
Assignee: plasma-b...@kde.org
Reporter: samping...@gmail.com
Target Milestone: 1.0
Created attachment 138545
--> https://bugs.kde.org/attachment.cgi?id=138545&action=edit
KSysGuard image of High CPU usage
SUMMARY
High CPU usage by plasmashell and firefox everytime and kscreenlocker joins
these two CPU hogs occasionally when switching user in KDE Plasma with NVIDIA
drivers.
STEPS TO REPRODUCE
1. Login to first user.
2. Switch user to another user.
3. Open KSysGuard or Plasma System Monitor and see plasmashell, firefox and
sometimes kscreenlocker from the first user hogging up 25-80% of CPU and
sometimes even cause memory leak.
OBSERVED RESULT
This issue was there ever since Plasma 5.19 for me, where plasmashell or
sddm-greeter or kscreenlocker would continuously use 25% CPU (any one at a
time) but it got (or at least it seemed to have been) resolved in 5.20 and
upto 5.21.3 (or 4) I didnt have this issue. But since 5.21.5 I have this issue
again. Whenever I switch user, plasmashell and firefox from first user always
uses 25-80% of CPU for no reason at all. Also when the other user session is
used for long periods, like for 30 minutes - 1 hour, there is a huge memory
leak and plasmashell gobbles up all 16 GB of RAM causing my entire system to
freeze.
Another problem is that when I logout from the second user account and return
to first user account, kwin crashes everytime which causes the compositing to
be disabled and plasmashell crashed 1 time. All these issues make using Plasma
unbearable and these issues need to be fixed.
I decided to test the switching user with intel graphics using nvidia-prime
and there was no issue like this. So I am also sending a bug report to
linux-b...@nvidia.com so that they can fix this if this bug is not from Plasma
side.
EXPECTED RESULT
Switching user should not result in high CPU usage or memory leak from the
inactive user causing Plasma to freeze and stutter. Returning back to the first
user account should not cause any crash to Plasmashell or KWin.
SOFTWARE/OS VERSIONS
Linux: Linux-Zen 5.12.4
KDE Plasma Version: 5.21.5 (and also tested in 5.21.90)
KDE Frameworks Version: 5.82.0
Qt Version: 5.15.2
ADDITIONAL INFORMATION
GPU: NVIDIA GeForce GTX 1060 6GB
Proprietary Driver 465.27
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