DisplayPort Monitor works only once and not anymore after switching VTs in gdm 3.30.0
After booting Ubuntu Cosmic Cuttlefish development I am able to see the login screen, but after I login, it doesn't continue anymore. Switching VTs displays a black screen on both VGA, LCD (builtin), and DisplayPort connected monitors. If I unplug the 4k DisplayPort Monitor the login screen/tty will show up and I am able to login and use the monitors (Due to lack of memory, I can only use two at one time) VGA (which is 1080p) and DisplayPort. Trying to do switch user with the 4k monitor plugged in will result in a black screen again.
Here's more info about the bug: https://bugs.launchpad.net/ubuntu/+source/gdm3/+bug/1791019