https://bugs.freedesktop.org/show_bug.cgi?id=101222

            Bug ID: 101222
           Summary: [amd-staging] No HDMI/DP surround sound with DC on RX
                    480
           Product: DRI
           Version: XOrg git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: chewi@gentoo.org

Created attachment 131555
  --> https://bugs.freedesktop.org/attachment.cgi?id=131555&action=edit
/proc/asound/HDMI/codec#0

I've been trying amd-staging on and off for a while in the hope of getting
HDMI/DP surround sound working. There seems to be very few people trying
amd-staging and even fewer trying surround sound as I haven't seen a single
mention of it anywhere. Is it even supposed to work yet?

Stereo output is working but multi-channel LPCM only appears on my receiver as
stereo and AC3 pass-through doesn't work at all. I had all this working on the
same system with my old HD 4670 and I've made do with S/PDIF from my on-board
sound in the meantime. I've tried directly with ALSA and via PulseAudio.

The latest kernel I've tried is 4.11 with
b382281b45ec359deeeeef715b182322f4fa9566. I've found alsa-lib and friends can
make a difference in the past so I just tried 1.1.4.

I'll attach some details. Note that I have a stereo monitor plugged into the
HDMI port and my receiver in the first DisplayPort. I obviously select the
right output when testing!

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