https://bugs.kde.org/show_bug.cgi?id=417146
Bug ID: 417146
Summary: compositing disabled on connecting/disconnecting
external monitor
Product: kwin
Version: 5.17.90
Platform: Archlinux Packages
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: compositing
Assignee: kwin-bugs-n...@kde.org
Reporter: mariusz.lib...@gmail.com
Target Milestone: ---
SUMMARY
Connecting or disconnecting an external monitor very often disables
compositing. It doesn't seem to happen 100% of the time, so it seems like some
kind of a race condition. When it happens KWin displays a message: "Desktop
effects have been suspended by another application. You can resume using the
'Alt+Shift+F12' shortcut.'". I thought that maybe it's Firefox, but no, it
happens even when there are no applications open at all, just an empty desktop.
STEPS TO REPRODUCE
1. Run KWin with compositing enabled.
2. Connect an external monitor.
OBSERVED RESULT
Compositing is disabled and KWin shows a notification as described above.
EXPECTED RESULT
Compositing continues to work.
SOFTWARE/OS VERSIONS
Operating System: Arch Linux
KDE Plasma Version: 5.17.90
KDE Frameworks Version: 5.66.0
Qt Version: 5.14.1
Kernel Version: 5.5.1-arch1-1
OS Type: 64-bit
Processors: 8 × Intel® Core™ i7-8550U CPU @ 1.80GHz
Memory: 7.6 GiB of RAM
ADDITIONAL INFORMATION
This bug is not new to 5.17.90, it's the same in earlier versions, at least in
5.17.
My external monitor is connected to HDMI port in my laptop via HDMI to VGA
adapter if that matters.
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