OK this sounds like an Nvidia kernel driver bug, or some other kernel
driver bug.
P.S. If you have TLP installed then please remove it as it is known to
also cause bugs like this.
** No longer affects: mutter (Ubuntu)
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> 1. Look in /var/crash for crash files ...
I did and could not find any recent ones - most recent was over a week
ago.
> 2. If step 1 failed then look at https://errors.ubuntu.com/user/ID where ID
> is the content of file /var/lib/whoopsie/whoopsie-id on the machine.
Nothing there that is
Here is the output of `journalctl -b-1 | tail` after waiting over a
minute on the blank screen and restarting. (In this case the screen
wasn't completely blank but had a non-flashing cursor in the top left
corner. It doesn't appear every time, only ~1/3 of wake from sleep
attempts.)
** Attachment
** Changed in: mutter (Ubuntu)
Status: New => Incomplete
** Changed in: nvidia-graphics-drivers-515 (Ubuntu)
Status: New => Incomplete
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Also next time the problem happens please:
1. Wait 10 seconds.
2. Reboot.
3. Run:
journalctl -b-1 > prevboot.txt
4. Attach the resulting text file here.
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Thanks for the bug report. Please check to see if some part of the
system has crashed:
1. Look in /var/crash for crash files and if found run:
ubuntu-bug YOURFILE.crash
Then tell us the ID of the newly-created bug.
2. If step 1 failed then look at https://errors.ubuntu.com/user/ID where
ID
