[Bug 200695] New: Blank screen on RX 580 with amdgpu.dc=1 enabled (no displays detected)

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=200695

            Bug ID: 200695
           Summary: Blank screen on RX 580 with amdgpu.dc=1 enabled (no
                    displays detected)
           Product: Drivers
           Version: 2.5
    Kernel Version: 4.18.0-rc7
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri at kernel-bugs.osdl.org
          Reporter: claude at mathr.co.uk
        Regression: No

Created attachment 277633
  --> https://bugzilla.kernel.org/attachment.cgi?id=277633&action=edit
dmesg after boot with amdgpu.dc=1 amdgpu.dc_log=1 drm.debug=6

When amdgpu.dc=1 is initialized at boot, the console goes blank as it thinks
all displays are disconnected.  Xorg is not able to enable the display either. 
With amdgpu.dc=0 all is fine.  Tried with various (mostly Debian) kernels from
4.16 through 4.18~rc4, all have the issue.  I built a 4.18~rc7 from kernel.org
to rule out Debian patches being the issue and will provide logs.

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