It appears that sometimes, nvidia is losing the *display* information.

(II) NVIDIA(0): Setting mode "NULL"

I can recover my display by running

xrandr --auto

Note: this may not work when you are logged into the console - you may
want to use something like "sleep 3; xrandr --auto" and then switch via
Ctrl+Alt+F7 within three seconds. I usually login from a remote machine.

It happens about once a month for me. :-(

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which is subscribed to xorg in Ubuntu.
https://bugs.launchpad.net/bugs/1268151

Title:
  [Dell M4800] DPMS support broken, fails to wake up the monitor after
  putting it to sleep

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