Thanks. This appears to be an Nvidia hardware or driver fault.

Since this is the first time I've ever seen this (other Nvidia users
don't seem to encounter the same issue) I would suggest the simplest
solution would be to change the graphics card. Otherwise you will need
to seek support from Nvidia themselves.

The recurring problems are:

Aug 28 09:42:35 greystone /usr/lib/gdm3/gdm-x-session[2279]: (WW) NVIDIA(0): 
WAIT (2-S, 17, 0x00e4, 0x00003fb8, 0x00004a1c)
Aug 28 09:42:42 greystone /usr/lib/gdm3/gdm-x-session[2279]: (WW) NVIDIA(0): 
WAIT (1-S, 17, 0x00e4, 0x00003fb8, 0x00004a1c)
Aug 28 09:42:45 greystone /usr/lib/gdm3/gdm-x-session[2279]: (WW) NVIDIA(0): 
WAIT (2-S, 17, 0x00e4, 0x00003fb8, 0x00004a1c)

and

Aug 28 09:08:05 greystone /usr/lib/gdm3/gdm-x-session[1681]: (EE) 
NVIDIA(GPU-0): WAIT (2, 8, 0x8000, 0x000009a8, 0x00001f44)
Aug 28 09:08:12 greystone /usr/lib/gdm3/gdm-x-session[1681]: (EE) 
NVIDIA(GPU-0): WAIT (1, 8, 0x8000, 0x000009a8, 0x00001f44)
Aug 28 09:08:19 greystone kernel: nvidia-modeset: WARNING: GPU:0: Lost display 
notification (0:0x00000000); continuing.
Aug 28 09:08:33 greystone kernel: nvidia-modeset: ERROR: GPU:0: Idling display 
engine timed out: 0x0000917d:0:0:954
Aug 28 09:08:44 greystone /usr/lib/gdm3/gdm-x-session[1681]: (EE) 
NVIDIA(GPU-0): WAIT (2, 8, 0x8000, 0x000009a8, 0x00001f4c)
Aug 28 09:08:51 greystone /usr/lib/gdm3/gdm-x-session[1681]: (EE) 
NVIDIA(GPU-0): WAIT (1, 8, 0x8000, 0x000009a8, 0x00001f4c)
Aug 28 09:10:03 greystone kernel: nvidia-modeset: ERROR: GPU:0: Idling display 
engine timed out: 0x0000917d:0:0:954
Aug 28 09:12:54 greystone rsyslogd[1394]: -- MARK --
Aug 28 09:13:04 greystone kernel: nvidia-modeset: ERROR: GPU:0: Idling display 
engine timed out: 0x0000917d:0:0:954
Aug 28 09:16:05 greystone kernel: nvidia-modeset: ERROR: GPU:0: Idling display 
engine timed out: 0x0000917d:0:0:954


** Changed in: gnome-shell (Ubuntu)
       Status: Incomplete => Invalid

** Also affects: nvidia-graphics-drivers-450 (Ubuntu)
   Importance: Undecided
       Status: New

** Also affects: nvidia-graphics-drivers-440 (Ubuntu)
   Importance: Undecided
       Status: New

** Summary changed:

- gnome-session fails, and fails, and fails yet again
+ [nvidia] Repeated screen freezes with GeForce GT 640 (GK107)

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https://bugs.launchpad.net/bugs/1892973

Title:
  [nvidia] Repeated screen freezes with GeForce GT 640 (GK107)

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