[Bug 107946] AMDGPU regression, multi-head not working on 4.18, 4.19RC3, but does on 4.16

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=107946

            Bug ID: 107946
           Summary: AMDGPU regression, multi-head not working on 4.18,
                    4.19RC3, but does on 4.16
           Product: DRI
           Version: XOrg git
          Hardware: x86-64 (AMD64)
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: dave at locochino.com

Created attachment 141576
  --> https://bugs.freedesktop.org/attachment.cgi?id=141576&action=edit
dmesg output on a broken system, using kernel 4.19_RC3

Multi-head on AMD Vega is not working on kernel 4.18 or 4.19RC, but works fine
on 4.16

I'm stuck at kernel 4.16 with my hardware, current stable kernels leave me with
just one display working.

Attaching dmesg output from 4.16, 4.18, and 4.19_RC3

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