[Bug 108608] Blank screen after KMS with Linux 4.19.0 on Hawaii (R9 290)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=108608

            Bug ID: 108608
           Summary: Blank screen after KMS with Linux 4.19.0 on Hawaii (R9
                    290)
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: abortretryfail at gmail.com

Created attachment 142294
  --> https://bugs.freedesktop.org/attachment.cgi?id=142294&action=edit
dmesg spew

With radeon.cik_support=0 and amdgpu.cik_support=1, I get a blank screen on
Linux 4.19.0. This worked fine on 4.18.16. Machine is still accessible via SSH,
but will not shut down successfully.

Using radeon instead of amdgpu is a work-around.

By the function names I'm guessing it's UVD/PowerPlay related, but this is out
of my realm of troubleshooting expertise. 

Attached dmesg snippet with traces and detailed error messages.

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