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

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

[bugzilla-daemon]

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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@lists.freedesktop.org
          Reporter: tim@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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[Bug 106846] RX480 with multiple HDMI ports shows monitor connected to unused port when using amdgpu.dc=1

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

--- Comment #1 from Tim Carr <tim@timcarr.me> ---
Created attachment 140061
  --> https://bugs.freedesktop.org/attachment.cgi?id=140061&action=edit
Xorg.log

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

[bugzilla-daemon]

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

--- Comment #2 from Tim Carr <tim@timcarr.me> ---
Created attachment 140062
  --> https://bugs.freedesktop.org/attachment.cgi?id=140062&action=edit
dmesg

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

[bugzilla-daemon]

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

Michel Dänzer <michel@daenzer.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |harry.wentland@amd.com

--- Comment #3 from Michel Dänzer <michel@daenzer.net> ---
Please also attach the dmesg output with amdgpu.dc=0.

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

[bugzilla-daemon]

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

--- Comment #4 from Tim Carr <tim@timcarr.me> ---
Created attachment 140064
  --> https://bugs.freedesktop.org/attachment.cgi?id=140064&action=edit
dmesg with amdgpu.dc=0

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

[bugzilla-daemon]

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

--- Comment #5 from Harry Wentland <harry.wentland@amd.com> ---
Created attachment 140930
  --> https://bugs.freedesktop.org/attachment.cgi?id=140930&action=edit
[PATCH] Report non-DP display as disconnected without EDID

Can you see if this fixes it?

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

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

--- Comment #6 from Tim Carr <tim@timcarr.me> ---
That fixed it. Everything seems good.

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

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

Tim Carr <tim@timcarr.me> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED

--- Comment #7 from Tim Carr <tim@timcarr.me> ---
The patch for this was included in Kernel 4.19. Going ahead and marking it as
resolved now that 4.19 is final.

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