Plasma 6 black screen nvidia gpu GT 630 - nouveau works ok

[aronkvh]

@vatbier

I had to struggle a lot to change the display configuration from 4k to 1080p (I think I have to press shift while hovering over the apply button for 5 seconds, wait a few seconds more and then press Apply and then there is a chance that the screen gets changed to 1080p ok (instead of a scrambled screen with random pixels at the top): I still haven’t figured out the exact workaround.

After you ran autoinstall, does about this system/graphics processor show llvmpipe or the GPU? I’ve had errors when it fell back to llvmpipe for some reason.
Also, you might try with another kernel version.