[ubuntu] Can't login after lock screen (black screen)

Hi!

After locking screen and monitor going into sleep mode, I can't get the login screen anymore, the monitor stays in sleep mode forever.
In previous Ubuntu versions after pressing any key or the mouse, the login screen showed up, but not anymore. I have to restart the computer.

How can I fix this issue?

Thanks!

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[ubuntu] Can't login after lock screen (black screen)