I was having the same issue. Everything seemed fine the it got to the frozen underscore.
I tried adding the two lines to /etc/gdm/custom.conf and the result was a flashing screen when it go to the gdm part. This time it didnt switch over to the underscore instead the screen kept blinking.
This was with the ubuntu terminal method. The second to last kernel (not 5.15) and hippie98. and nobo.... fedora 36...
still haven't had a successful boot.
edit:
I found this... maybe this has some info that would be helpful? over my head but maybe someone might see something help full in it.
https://askubuntu.com/questions/297080/ubuntu-boots-to-a-black-screen-with-blinking-a-underscore-character-after-releas
edit2:
tried again, added bootargs to 50mb partition and used aeolia 1.9 5.4 kernal from here;
https://github.com/whitehax0r/ArchLinux-PS4v2
hippie98 for the init.
got to the blinking _ then eventually freezes.
cannot get to ctrl alt f2
next attempt will use the init from https://github.com/whitehax0r/ArchLinux-PS4v2