Comment 6 for bug 1292438

HDMI-1-0 disconnected (normal left inverted right x axis y axis)

seem bug of the graphic driver to inform audio about hdmi is plugged

control.1 {
  iface CARD
  name 'HDMI/DP,pcm=3 Jack'
  value true
  comment {
   access read
   type BOOLEAN
   count 1
  }
 }

the hdmi codec only support stereo or digital passthrough, and does not support multichannel LPCM

this require your hdmi tv support AC3 decode for multi channel using digital passthrough

Node 0x02 [Audio Output] wcaps 0x201: Stereo Digital
  Converter: stream=1, channel=0
  Digital: Enabled
  Digital category: 0x0
  IEC Coding Type: 0x0
Node 0x03 [Pin Complex] wcaps 0x400381: Stereo Digital
  Control: name="HDMI/DP,pcm=3 Jack", index=0, device=0
  Control: name="IEC958 Playback Con Mask", index=0, device=0
  Control: name="IEC958 Playback Pro Mask", index=0, device=0
  Control: name="IEC958 Playback Default", index=0, device=0
  Control: name="IEC958 Playback Switch", index=0, device=0
  Control: name="ELD", index=0, device=3
  Pincap 0x00000094: OUT Detect HDMI
  Pin Default 0x18560010: [Jack] Digital Out at Int HDMI
    Conn = Digital, Color = Unknown
    DefAssociation = 0x1, Sequence = 0x0