I tested some more. After logging out and receiving the broken video mode, I 
can press  ctrl+alt+F2 and get a textmode login screen. If I then immediately 
press ctrl+alt+F1 I get to the graphic login screen, and can login again.
Pressing ctrl+alt+F1 directly at the broken video mode does nothing, though.
I'm attaching the output of 'journalctl'  (without -b 1 as I did not need to 
reboot)  (output compressed with bzip2)

** Attachment added: "output of 'journalctl' compressed with bzip2"
   
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1926023/+attachment/5492535/+files/journalctl.bz2

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https://bugs.launchpad.net/bugs/1926023

Title:
  display broken on logout

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