OK there seems to be something screwy going on with the amdgpu.dpm option - if
that's set to 0, it still results in a blank screen. It has to be removed
entirely from the kernel command line for boot to work for me on 4.19.

I'm not sure if that's a different bug or not, but can anyone who had success
with removing the option, also test with amdgpu.dpm=0 to see if it still
results in a blank screen?

Also, are FD BZ email notifications broken for anyone else?