Because system hangs up after loading amdgpu module, I cannot get dmesg
directly at that time.
Therefore, I load efi-pstore module to store the dmesg in efi before panic
happens.

The attachments:
"dmesg before loading amdgpu module": dmesg before loading amdgpu module
"Oops1~7 after loading amdgpu module": I gather the dmesg stored in efi-pstore,
which is during the panic happening.  I concatenate them with the Oops number
and order by the part number.