Only partial screen update after last stable update [2020-12-30]

I believe you might have the same situation like I had, with the driver installed but not providing hardware acceleration - [SOLVED] GT520 + linux54 5.4.85-1 + linux54-nvidia-390xx 390.138-2 = absolutely terrible performance. It may or may not be the cause of your screen artifacts, but maybe it is worth checking. And maybe the next step would be to check if the compositing is on (KDE turns it off on boot if it detects a problem with hardware acceleration, maybe it’s something similar for GNOME, I don’t know).
(You asked for ideas :))

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