This happens to me too, but with Ubuntu 20.04. It started shortly after
the latest nvidia-graphics-driver-470 update. Symptoms are:
* graphical output freezes completely
* no reaction to any kind of input (no switching to tty either)
* ssh works and shows Xorg as using 100% CPU
* Xorg process can't be killed
* shutdown command is not executed (only ssh connection is terminated)
My GPU: GTX970. I've never had this problem before, although my PC is
has not been modified for years. Now it happens multiple times per day!
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https://bugs.launchpad.net/bugs/1942271
Title:
Spontaneous NVIDIA panic
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