Created attachment 166335 [details]
journald log of the kwin crash.

SUMMARY

Almost every time I wake up my external 4K display, I can immediately see a lot of glitched windows, and the system is temporarily unresponsive. Most times, plasma can sooner restore everything so I can continue working. But, sometimes the plasma can not restore. It crashed and all the windows already opened are gone. Sometimes, both kwin and plasma do not survive, and my system sends me back to sddm login screen.

I have attached the journald log and backtrace of one recent kwin crash and two backtraces of plsama crashes which happened several days ago.

This problem has bugged me for at least 5 months, and after searching for a long time I still don't understand what has happened.


STEPS TO REPRODUCE
1. Wait for the display to automatically switch off.
2. Use the mouse to wake up the display.

OBSERVED RESULT
A lot of glitches, sometimes the desktop and the compositor crashes. 

EXPECTED RESULT
Plasma should work without any glitches and crashes.

SOFTWARE/OS VERSIONS
PC: Intel NUC 12 PRO featuring an i5-1240p
Linux: Arch Linux
Kernel: 6.7.6-zen1-2-zen
Graphics Platform: wayland
KDE Plasma Version: 5.27.10
KDE Frameworks Version: 5.115.0
Qt Version: 5.15.12

ADDITIONAL INFORMATION