[Bug 109135] R9 390 hangs at boot with DPM/DC enabled for kernels 4.19.x and above, says KMS not supported

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=109135

            Bug ID: 109135
           Summary: R9 390 hangs at boot with DPM/DC enabled for kernels
                    4.19.x and above, says KMS not supported
           Product: DRI
           Version: XOrg git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: critical
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: rmuncrief at humanavance.com

Created attachment 142874
  --> https://bugs.freedesktop.org/attachment.cgi?id=142874&action=edit
Example of failed amdgpu boot with R9 390.

I'm running the latest Manjaro and have a Sapphire Nitro R9 390. Kernels before
4.19.x work great with amdgpu, but all kernels from 4.19.x on hang at boot, and
usually don't even generate a boot log, no matter how long you wait.

However after compiling and testing the latest linux-amd-wip-git I was able to
get a log so I can finally file a bug. By the way, I've gotten a few logs
before but lost them while debugging, however this time I had the sense to save
it.

In nay case, the error line is always the same:

AMDGPU(0): [KMS] drm report modesetting isn't supported.

This only happens if you set amdgpu.dpm=1 and/or amdgpu.dc=1 with the bad
kernels. If you leave those options out amdgpu works, but things like resuming
from suspend, etc. don't work.

I've attached Xorg.0.good.log to show a good boot with kernel 4.18.20, and a
Xorg.0.bad.log to show the failed boot with amd-wip-git. And by the way I've
tried numerous kernels over the last weeks and they all fail the same way, but
if you want me to test a specific kernel I'll be happy to do so.

Here's the grub line I use for all testing:
GRUB_CMDLINE_LINUX_DEFAULT="quiet
resume=UUID=b4f71480-8fe3-43c2-99c9-fc3f5687545b libata.atapi_passthru16=0
rd.modules-load=vfio-pci amd_iommu=on iommu=pt amdgpu.modeset=1
radeon.si_support=0 radeon.cik_support=0 amdgpu.si_support=1
amdgpu.cik_support=1 amdgpu.dpm=1 amdgpu.dc=1"

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