Please wait until the problem happens again and then collect a fresh
system log:

  journalctl -b0 > journal.txt

or if you had to reboot after it happened run:

  journalctl -b-1 > prevboot.txt

and then attach the resulting file here. Please also follow the
instructions in comment #3.

** Changed in: mutter (Ubuntu)
       Status: Confirmed => Incomplete

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https://bugs.launchpad.net/bugs/1871475

Title:
  [amdgpu] Black screen after screen lock

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