after one of the last Stable updates ( the small one that included the new version of gdm ) I restarted and after seeing display output during early boot, I got stranded in a black screen without a cursor.
After trying several different things I switched my desktops GPU, an AMD RX550, with a different GPU an AMD 5700XT. With the 5700 I was able to boot into Manjaro without problems, switching them back resulted in the issue I just described before.
In the end it turned out that I can use my RX550 only if I apply the amdgpu.dc=0 parameter to GRUB_CMDLINE_LINUX_DEFAULT.
I was however unable to find out why I do need that now all of a sudden and what exactly it does.
If anyone can point me in the right direction or give an explanation I would be grateful!
Thanks in advance!