I had the same screen corruption and fixed the screen corruption by adding a DP → HDMI adapter only for linux, which forces the linux driver to stay at 24bits and not 30bits.
Unfortunately I haven’t received any response from NVIDIA after sending bugreport per mail (01.06.2021) - it is just a dark hole.
In the end, the culprit was the docking station not able to keep up with 30bit Colordepth (which was shown by Monitor’s OSD).
In Windows no screen corruption, there 24bit depth is used.
Askubuntu Question:
My artifacts on 2x4k 42’ screens:
Anyway, I have couple more reliability problems with NVIDIA - especially daily docking/undocking from between HomeOffice<->Workplace.
I posted bugs at freedesktop, and according to X11 Maintainers definitely NVIDIA problem: See
Anyway, at least I am happy, that it works “somehow” :-(