[Bug 103771] New: no HDMI audio Radeon RX 460

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=103771

            Bug ID: 103771
           Summary: no HDMI audio Radeon RX 460
           Product: xorg
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/Radeon
          Assignee: xorg-driver-ati at lists.x.org
          Reporter: marceloslacerda at gmail.com
        QA Contact: xorg-team at lists.x.org

Created attachment 135504
  --> https://bugs.freedesktop.org/attachment.cgi?id=135504&action=edit
avivotool regs hdmi in the running system

I am running Debian Stretch (kernel 4.9.18) with ati driver 1:7.8.0-1, on an
GA-970A-DS3P board that has a Radeon RX 460 off-board. Further specs:

processor: AMD FX(tm)-8300 Eight-Core Processor
chipset: AMD 970

Attached to the board is my Monitor, via HDMI.

Vanilla install works fine, except: no audio via HDMI.

pavucontrol shows me that the HDMI output is recognized correctly[1] but when I
plug anything to it I get no output (on windows I get audio with catalyst
driver). The analog audio output (front of the case output) works as expected.

Curiously pavucontrol reports "HDMI / DisplayPort (plugged in)" even when
there's nothing connected to the HDMI audio output.

Because this bug is based on another with a "Radeon HD 6310"[2] I have figured
that it could be useful to attach the output of "avivotool regs hdmi".

Any clue as to what to try next?

[1] https://u.teknik.io/VUsQe.png
[2] https://bugs.freedesktop.org/show_bug.cgi?id=67767

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