After switching off fullscreen MPV window screen starts blinking
Enabling disable compositor for full screen windows fixes the problem for full screen, but screen starts blinking for dialogs and other stuff
Steps to Reproduce:
1. Go full screen
2. Leave full screen
Created attachment 98571 [details]
Don't know if that helps but, I use a nvidia card with binary drivers.
When I enable the effect to show updated parts of the screen it blinks like crazy and shows the mpv video screen being updated, even when behind another maximized window.
I also use export __GL_YIELD="USLEEP" in my environment
Notice what may be the cause:
I'm currently playing Transistor game (Steam).
As soon as I leave the game, that issue start to occur.
Also, if I disable the compositing (Alt + Shift + F12), my taskbar shows two more tasks: Steam and Transistor game.
Maybe Kwin is holding the tasks? Or at least their icons? As far as I can tell the processes are dead since there is no trace of them in ps command output.
KWin cannot "hold tasks" - the taskbar and kwin operate on common information, though.
The problem will be related to bug #361154
Instead of fullscreen unredirection, try to downforce the compositor blocking through "kcmshell5 kwinrules" (see https://bugs.kde.org/show_bug.cgi?id=361154#c41 and ignore the snarky tone) or explicitly suspend the compositor before running the game.
There seems to be the same bug, thanks.
I confirm that disabling compositing before opening the game worked.
*** This bug has been marked as a duplicate of bug 361154 ***