Comment # 2 on bug 1177256 from Takashi Iwai

(In reply to David Fong from comment #0)
> 2020-10-03T16:11:09.966215+10:00 localhost kernel: [    3.851924] mc: Failed
> to load firmware "amdgpu/polaris10_mc.bin"

Make sure that you have this file under /lib/firmware.

If the file is there, it's likely a problem of initrd, and it can be some
(long-standing) issue of amdgpu-pro package.