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

[bugzilla-daemon at freedesktop.org]

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

--- Comment #21 from Shecks <shecks at gmail.com> ---
I'd like to report that I am have been experiencing the same issue. After
upgrading (Fedora 29) from kernel 4.18.18 to 4.19.2 my PC would no longer boot.

I have a an MSI R9 390 GPU and have been using the the following kernel
parameters successfully with previous kernels:-

amdgpu.dc=1 radeon.cik_support=0 amdgpu.cik_support=1 amdgpu.dpm=1

After upgrading to kernel 4.19.2 my PC will boot to GRUB but then, as others 
have posted, the screen goes black (just before the Plymouth loader is
displayed and the switch from text to graphics mode) and then the monitor goes
into standby as no video output is detected.

I have tried booting without the rhgb kernel parameter but this does not solve
the issue, however as suggested by freedesktop above, I removed the
amdgpu.dpm=1 kernel parameter and can now successfully boot the 4.19.2 kernel.

With previous builds I found that my PC was not stable without the amdgpu.dpm=1
parameter and the GPU would crash as soon as I did anything graphics intensive
(I presume this was due to the GPU power state changing) so I have run the
Unigine Heaven bench mark and so far it seems to be stable (previously on
kernels without amdgpu.dpm=1 the GPU would crash either before Unigine Heaven
had been started or shortly afterward)

I hope this helps pinpoint the issue and if anyone can suggest other tests I
can run to get more information please let me know.

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