Comment 19 for bug 1894627

I have had this problem both on 20.04 and now in 20.10 (and long before those). I believe it is same as
https://unix.stackexchange.com/questions/600805/fuzzy-graphics-after-suspend-win-nvidia-drivers

I tried the instructions in
https://download.nvidia.com/XFree86/Linux-x86_64/450.57/README/powermanagement.html
but the machine could not come back from suspend

I think this is a manifest of NVIDIA has volatile GPU RAM