Bug 448434

SUMMARY
***
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***


STEPS TO REPRODUCE
1. Log into KDE Plama
2. Leave the session temporarily, either with system suspend or hibernate, or entering, for example, ctrl-alt-f4 to use a system console.
3. Return to the plasma session, either by waking up from suspend or hibernate, or entering alt-f1 to go back from a virtual console.

OBSERVED RESULT
The screen is all black.  I cannot get the session back.  If I open a system console with ctrl-alt-f4, I can kill the processes in the session and try again, although I normally log into a different DE, GNOME in my case.

EXPECTED RESULT
Return to plasma shell, with all state properly restored (if necessary).

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: 5.23.90, in Arch Linux
(available in About System)
KDE Plasma Version: 5.23.90
KDE Frameworks Version: ?? I don't know
Qt Version: 5

ADDITIONAL INFORMATION
I have seen this problem referenced elsewhere.  It's been present for a number of months.  I thought it might be fixed in 5.24.  Arch Linux released the beta of 5.24 today, and I checked to see if it was fixed, but the problem is still present.

My processor is from AMD.  The graphics chip is radeon.

The problem is similar to the report for bug 447647, and may well be a duplicate.