Comment 33 for bug 1155202

are you using latest alsa driver ?

most likely the digital spdif is conflicct with hdmi codec when both try to create those IEC958 controls

https://git.kernel.org/cgit/linux/kernel/git/tiwai/sound.git/commit/?id=dcda5806165c155d90b9aa466a1602cf4726012b

Node 0x10 [Audio Output] wcaps 0x611: Stereo Digital
  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="IEC958 Default PCM Playback Switch", index=0, device=0
  Device: name="ALC892 Digital", type="SPDIF", device=1
  Converter: stream=8, channel=0
  Digital: Non-Copyright
  Digital category: 0x12
  IEC Coding Type: 0x0
  PCM:
    rates [0x5f0]: 32000 44100 48000 88200 96000 192000
    bits [0xe]: 16 20 24
    formats [0x1]: PCM
  Power states: D0 D1 D2 D3 EPSS
  Power: setting=D0, actual=D0