Comment # 2 on bug 1226438 from Stefan Dirsch

Please try to access such a system with ssh. Then rmmod the nvidia modules, if
already loaded.

  rmmod nvidia_drm
  rmmod nvidia_modeset
  rmmod nvidia_uvm
  rmmod nvidia

Then reset dmesg.

  dmesg -c > /dev/null

Then load again nvidia

  modprobe nvidia

Run and attach dmesg output

  dmesg