STEPS TO REPRODUCE
1. Install Artix linux use it for 1 year no problems
2. Pacman -Syu to get plasma 6
3. Experience black screen lag/hang on lock and unlock

OBSERVED RESULT

When logging in, the desktop momentarily shows, then it goes black and only mouse cursor is visible, if I mash the start button eventually it pops up and the black screen goes away.

Similarly, when locking the session, instead of going to the lock screen the screen goes black, sometimes monitor gets no signal, then the lock screen pops up.


EXPECTED RESULT

Log in and desktop should load without black screen hang. Lock session and login screen should load without black screen hang.


SOFTWARE/OS VERSIONS
Linux/KDE Plasma:  Artix Linux
(available in About System)
KDE Plasma Version:  6.0.1
KDE Frameworks Version:  6.0.0
Qt Version:  6.6.2

ADDITIONAL INFORMATION

This only happens on X11. Does not happen on Wayland. Did not happen before Plasma 6 update.