https://bugs.kde.org/show_bug.cgi?id=406195
Bug ID: 406195
Summary: If QT_SCALE_FACTOR is set to 2, Kwin doesn't start and
runs at 100% CPU forever
Product: kwin
Version: 5.12.7
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: kwin-bugs-n...@kde.org
Reporter: m...@nbrogi.com
Target Milestone: ---
SUMMARY
If QT_SCALE_FACTOR is set to 2, Kwin doesn't start and runs at 100% CPU
forever. Running with QT_SCALE_FACTOR set to 1 works.
STEPS TO REPRODUCE
Start Kwin with "QT_SCALE_FACTOR" set to 2, for instance like so:
"(export QT_SCALE_FACTOR=2; kwin --replace &)"
OBSERVED RESULT
Kwin kills the current window manager, but then doesn't start and runs at 100%
CPU forever. Can only be killed with "kill -9".
EXPECTED RESULT
Kwin should start normally
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Xfce on Ubuntu Bionic
KDE Plasma Version: 5.12.7
KDE Frameworks Version: 5.44.0
Qt Version: 5.9.5
ADDITIONAL INFORMATION
This problem seems to be caused by a combination of environmental variables
that I'm running. If I create a brand new user, Kwin can start correctly even
with QT_SCALE_FACTOR set to 2. Which variables are causing the problem, I
cannot figure out.
I actually figured out that I had originally opened another bug at
https://bugs.kde.org/show_bug.cgi?id=398965, but last time I failed to figure
out how to get a backtrace of the process. This time, I'm also attaching
backtrace (sorry, don't know how to output to file so it's an image).
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