Activate AMDGPU for CI or SI generation

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Turns out the issue was amdgpu.dc=1. I thought I tried booting without it before making this thread, but perhaps not. In any case, to summarize, the method to get AMDGPU for these two generations are

  1. Edit /etc/default/grub, at the GRUB_CMDLINE_LINUX line add radeon.si_support=0 amdgpu.si_support=1 radeon.cik_support=0 amdgpu.cik_support=1 inside the quotation. You may also optionally add amdgpu.dpm=1 amdgpu.modeset=1 at your own risk, your hardware may or may not take that well.
  2. Run sudo grub2-mkconfig
  3. Reboot
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