https://bugs.kde.org/show_bug.cgi?id=425557
--- Comment #6 from Michael <k...@callthecomputerdoctor.com> ---
I (In reply to Forest from comment #4)
> I may be experiencing the same problem. When it happens:
> 
> - I can still move the mouse pointer.
> - Mouse clicks and drags are ignored.
> - Nothing other than the mouse pointer changes on-screen.
> - Keyboard input still works (shortcuts, typing text, etc.) but since no
> screen updates happen, it looks like nothing is happening.
> - Switching virtual consoles Control+Alt+F8/F7 does not clear the problem.
> 
> I cannot reproduce it on demand, but when it happens, it's always when an
> application disables the compositor, such as when a video player switches to
> full screen.
> 
> I can regain control of my desktop by manually re-enabling the compositor
> with Shift+Alt+F12.
> 
> However, once the bad state has been triggered once, every subsequent
> attempt to disable the compositor (either by an app or with Shift+Alt+F12)
> freezes the desktop again.
> 
> If I reboot, the compositor can once again be switched off or on without any
> trouble, until the problem appears again. That might take hours or days.

I have been experiencing this exact same issue under X11 since I upgraded my
KDE neon laptop to Plasma 5.27. Never happened under 5.26, but it's happening
almost every day. It seems to trigger after a long period of time on its own,
without any user interaction. I can be away from my computer for awhile and
come back and find that it appears to be dead except for a movable cursor. 

Disabling the compositor with Shift+Alt+F12 is what gets my session usable
again, but the Plasma panels are non-responsive though I see that plasmashell
is still running with htop. 

I've been trying to find a pattern for what causes it, and the I've noticed
that plasma-systemmonitor is the only program that seems to be in an
unresponsive state when it happens and needs to be forcibly killed.
Correlation? Maybe.

I was thinking it was some byproduct of the OpenGL drivers, so I installed the
Obiaf PPA to get the latest Mesa, but there was no change. 

Since this is such an odd bug, I don't even know how to describe it to file it
as a bug.

Operating System: KDE neon 5.27
KDE Plasma Version: 5.27.4
KDE Frameworks Version: 5.105.0
Qt Version: 5.15.8
Kernel Version: 5.19.0-38-generic (64-bit)
Graphics Platform: X11
Processors: 16 × AMD Ryzen 7 6800H with Radeon Graphics
Memory: 14.9 GiB of RAM
Graphics Processor: AMD Radeon Graphics

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