[Bug 106846] RX480 with multiple HDMI ports shows monitor connected to unused port when using amdgpu.dc=1

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=106846

            Bug ID: 106846
           Summary: RX480 with multiple HDMI ports shows monitor connected
                    to unused port when using amdgpu.dc=1
           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: tim at timcarr.me

Created attachment 140060
  --> https://bugs.freedesktop.org/attachment.cgi?id=140060&action=edit
'xrandr -q' output with and without amdgpu.dc enabled.

Card is an ASUS DUAL-RX480-04G. When booting with amdgpu.dc=1, as is default on
4.17+, the system shows a monitor on both HDMI ports when only one is
connected. This causes a low-resolution login screen and requires disabling the
non-existent monitor to prevent some windows from being opened off screen.

Attached is the 'xrandr -q' output from booting with and without amdgpu.dc
enabled. Behavior is the same regardless of which HDMI port is used.

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