https://bugs.kde.org/show_bug.cgi?id=428633
Bug ID: 428633
Summary: Opening any QT application or application wiht QT
decoration freezes system
Product: plasmashell
Version: 5.18.5
Platform: Ubuntu Packages
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Target Milestone: 1.0
SUMMARY
When opening a QT application, the whole system freezes for few milliseconds.
So, playing video in mpv you can notice stutter while opening Dolphin or
Konsole, but Nautilus does not have this effect.
STEPS TO REPRODUCE
1. Play video in any stable video player and turn on "keep above others" as not
to cover it with another window.
2. While there is any slow vertical or horizontal camera movement, open
Dolphin.
3. While there is any slow vertical or horizontal camera movement, open
Nautilus.
OBSERVED RESULT
Stutter in playback. If FPS indicator effect turned on, spike and freeze.
EXPECTED RESULT
Uninteruppted playback suitable for video projection events and multimedial
workstation.
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Pop!_Os 20.04
(available in About System)
KDE Plasma Version: 5.18.5
KDE Frameworks Version: 5.68.0
Qt Version: 5.12.8
ADDITIONAL INFORMATION
Same result on Debian Sid, Ubuntu 20.10 and Manjaro (Stable). Disabling
composition helps the problem.
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