When my computer blanks the screen after the timeout (10 minutes) or after I turn off the monitors and turn them back on some time later, I only see a black screen with the mouse pointer. I can move the mouse pointer, but nothing else happens.
I am able to switch to the console with Ctrl + Alt + F3 and then switching back to the display with Ctrl + Alt + F1 gives me the login screen. But after logging in, I get the same problem.
Restarting gdm3 from the console does not seem to help. It gets stuck initializing and then I have to hard shutdown. The only thing that works is to restart the machine from the console, but that is annoying.
Has anyone else experienced this problem or have any ideas on how to fix this?
My machine is Ubuntu 18.04 with the 4.15.0-32-generic kernel.