[Bug 108781] 4.19 Regression - Hawaii (R9 390) boot failure - Invalid PCC GPIO / invalid powerlevel state / Fatal error during GPU init

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https://bugs.freedesktop.org/show_bug.cgi?id=108781

--- Comment #38 from DanglingPointerException@gmail.com ---
(In reply to Alex Deucher from comment #37)
> (In reply to DanglingPointerException from comment #36)
> > [drm:gmc_v7_0_sw_init [amdgpu]] *ERROR* Failed to load mc firmware!
> > [drm:amdgpu_device_init.cold.31 [amdgpu]] *ERROR* sw_init of IP block
> > <gmc_v7_0> failed -2
> > [drm] amdgpu: finishing device.
> 
> The driver is not able to find the firmware when it loads.  Please make sure
> the initrd contains the firmware if you are using one.  Please note that
> when using amdgpu, the firmware must be in /lib/firmware/amdgpu rather than
> /lib/firmware/radeon.

Thanks for the tip/hint on how to go about starting to sort it out. I have
SOLVED the problem and the R9-290X now fully works with Mesa 18.3 and Linux
Kernel 4.20.0

[SOLVED]
My Solution for those wishing to migrate to 4.20.0 with R9-290/X

1) Removed amdgpu.dpm=x completely from linux commandline and updated grub. '0'
or '1' will NOT work and will not boot, NOT even tty
2) copied /lib/firmware/radeon/* to /lib/firmware/amdgpu/
3) backed-up all contents of /lib/firmware/radeon/*
4) deleted /lib/firmware/radeon/
5) ensured initrd for 4.20.0 was in the /boot location
6) sudo update-initramfs -u
7) confirm contents of functioning/working kernel via "~$ lsinitramfs
/boot/initrd.img-<YOUR-KERNEL>-generic | grep hawaii" It needs to still point
to the /lib/firmware/radeon even though we have deleted it.
8) confirm contents of new kernel that isn't functioning. For me the kernel was
"~$ lsinitramfs /boot/initrd.img-4.20.0-042000-generic | grep hawaii"  It
should only contain /lib/firmware/amdgpu/*
9) Restore /lib/firmware/radeon/* from backup. This is so you can recover to
the previous kernel version if necessary.
10) Restart/Reboot
11)[OPTIONAL-IMPORTANT] If all working well (it is for me) then for no
conflicts for future kernels, delete /lib/firmware/radeon THEN delete all
previous kernels prior to the new kernel that is now functioning.  If you do
NOT do this AND install a new Kernel AND then run the command update-initramfs,
then you will have duplicate paths in the initrd for the future kernel.  Not
sure what happens when that happens, I'm not testing to find out as haven't got
time for it.

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