https://bugs.kde.org/show_bug.cgi?id=491052

--- Comment #11 from cwo <christoph.w...@gmx.de> ---
(In reply to Martin Senftleben from comment #10)
> Now I had more time to test it under wayland. I have the impression that the
> hickup happens when the mouse cursor moves to the top left corner of the
> screen.

This makes me think that kwin's screen corner feature may be involved (that the
edge turns blue under wayland even more so).

Go System Aettings > Mouse & Touchpad > Screen Edges, and see if something is
configured to happen in the top left corner (in the monitor image, there would
be a block in the square in the top left corner).

If there is, please report back what it is. You can also try removing this
effect to see if the problems persist with this disabled. (Click on the square,
then select "No Action".

> First it freezes, I can't even move the mouse cursor,
> the top left corner is blueish. Then, after a few seconds, the screen goes
> black, some non-ASCII characters appear on the top left of the screen (about
> 5 to ten characters, in monospace as if it's a CLI without prompt), and then
> the desktop appears again, however some apps have shut down (actually they
> crash), the remaining ones are all gathered on the virtual desktop one,
> while before that they were on different virtual desktops.

That's a Wayland compositor crash, I think. 

I suspect that you have the overview effect bound to the top left corner, and
your graphics card driver is crashing for some reason when you activate it,
taking kwin with it. (Or there's a bug in kwin that triggers under specific
circumstances that happen on your computer).

Do you see the crash reporter, or can you access a crash with the KDE Crashed
Process viewer or coredumpctl?

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