after my last problem, it is me again. It is basically still the same problem, but I managed to get a little bit further.
Without nomodeset the last printed message is
fb0: switching to amdgpudrmfb from EFI VGA. Apparently this might not actually mean that my PC hangs, but rather that it fails to output anything new to the screen. Theoretically I should be able to ssh into my PC, but I wasn’t able to test that (WIFI is not activivated until I log in).
With nomodeset enabled I was able to boot into kde neon and install the latest kernel (5.5.0-rc5) and the latest MESA (Mesa 20.0.0-devel from oibaf ppa). I tried that because the Phoronix article mentioned getting it to work that way
I also already tried using the
amdgpu.dc=0 boot options, but to no avail. Same goes for using
amdgpu.dpm=0, which I read somewhere.
I then tried other kernel versions, but I always end up having the same problem of hanging at the message above.
I tried the exact same setup with my old R7 260X and it work flawlessly.
Is there anything else I can try? I am not yet giving up on my RX 5500XT
I also tried to install kde neon in not-EFI mode, but ran into a different problem there:
SEV: failed to get status. Error: 0x0 but that is apparently okay, because we want it to fail if the sev command times out?