https://bugs.kde.org/show_bug.cgi?id=368021
Bug ID: 368021
Summary: Task switcher causes screen to freeze/pause until
triggered again with alt-tab
Product: kwin
Version: 5.6.5
Platform: Ubuntu Packages
OS: Linux
Status: UNCONFIRMED
Severity: normal
Priority: NOR
Component: effects-window-management
Assignee: kwin-bugs-n...@kde.org
Reporter: j...@cmail.nu
Occasionally when I use alt-tab task switcher in KDE Plasma the new window will
appear, but be frozen. Activity is not paused, only the screen.
Reproducible: Sometimes
Steps to Reproduce:
1. Alt-tab to a new window
2. Observe if the window is actually active or not (graphical response, text
typed, etc)
Actual Results:
Screen is frozen/paused, but user activity continues in the background. It is
just not visible.
Expected Results:
Switch to the window and make it active and visible without freezing.
If I alt-tab again it usually fixes it. Activity does not get suspended. E.g.
if I switch to a text editor and type some things, while the screen appears
frozen the text I typed will appear once I alt-tab again to fix the screen
glitch.
Sometimes the drawing of the window only partially completes (there will be
some blur leftover), at other times it appears to have drawn correctly but it
is frozen until I alt-tab again.
I have tried multiple different task switchers including Grid and Informatve.
If I turn off the Compositor I no longer have the problem but lose all effects.
I use OpenGL 3.1, GLX as it is the only one that I could get to work with my
hardware. (Intel integrated graphics chip: 00:02.0 VGA compatible controller:
Intel Corporation 4th Gen Core Processor Integrated Graphics Controller (rev
06))
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