https://bugs.freedesktop.org/show_bug.cgi?id=104391

            Bug ID: 104391
           Summary: DC R9 285 HDMI audio regression since drm/amd/display:
                    try to find matching audio inst for enc inst first
           Product: DRI
           Version: DRI git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: adf.lists@gmail.com

R9 285 Tonga with DC (only DC ever worked for HDMI audio with this card/TV
combo)

Haven't tested any other use cases other than mine = 

HDMI TV is off DVI-D monitor is on with X running, Turn on TV, do 
xrandr --output HDMI-A-0 --auto && xrandr --output HDMI-A-0 --below DVI-D-0

Since this commit I get no sound.

commit cfb071f7a9673109415d097125b3c12c16836acc
Author: Charlene Liu <charlene.liu@amd.com>
Date:   Wed Nov 15 18:55:57 2017 -0500

    drm/amd/display: try to find matching audio inst for enc inst first

    [Description]
    in eDP+ HDMI/DP clone or extended configuration, audio inst changed from
inst 1 to inst0.
    No failure related this though, just playback device endpoint inst changed.
    Also  remove one addition register read.

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