Originally Posted by FDD
The serial line becoming unresponsive after boot sounds to me likely because of a different speed setting: it should be 115200 for the login prompt.
Sorry, I should have been more clear: I still see messages on the serial line, but I just can't input anything.
Edit: Adding no_console_suspend to the bootargs solves the problem
Does anyone know the root password? Single user mode works, so I just replaced it for the time being.