https://bugs.kde.org/show_bug.cgi?id=411506
--- Comment #4 from Vlad Zahorodnii <vladz...@gmail.com> ---
> Compositing is not possible
If you get this message, then it could mean couple things. Either some
important X11 extension is missing, or OpenGL compositing is unsafe. We
consider OpenGL compositing unsafe if it takes too long (more than 15 seconds)
to "render" a frame.
Did you see "Freeze in OpenGL initialization detected" along "kwin_x11[36260]:
kwin_core: Compositing is not possible" in journalctl output by any chance?
Please run two commands below when kwin is not able to restart compositing and
post the output here.
qdbus org.kde.KWin /Compositor openGLIsBroken
qdbus org.kde.KWin /Compositor compositingNotPossibleReason
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