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On Ubuntu 20.04 sometimes when I get out of sleep I have just a black screen. I might get it also just when I get out of the lockout. The login page does not appear I just have a black screen.

I use 2 screens, the first one is a laptop screen reversed and an external monitor which is the primary one.

So I think that it's a GDM issue. Where to check what bugs? Is there any log file?

London Smith
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  • Are you able to access a TTY terminal or is that black as well? Here is a previously asked answer that explains what TTY is if you aren't sure: https://askubuntu.com/questions/66195/what-is-a-tty-and-how-do-i-access-a-tty – denNorske Sep 11 '21 at 21:54
  • Not at all the time, but I did! Once on the TTY terminal I just did a reboot finally. – London Smith Sep 11 '21 at 23:08
  • Do you have noveau in use? (Nvidia driver)? That only applies if you have a nvidia card in your system. – denNorske Sep 12 '21 at 08:10
  • I have the Nvidia proprietary driver installed with flatpack nvidia-470-57-02 org.freedesktop.Platform.GL.nvidia-470-57-02 1.4 user – London Smith Sep 12 '21 at 10:19

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