but 0x02 is stereo digital , how can you select mono in gnome-control-
center sound  or gnome-control-center sound-nua?

As Pulseaudio already using module-switch-on-available-port which
require hda jack detect and there is no hda jack implemented in
patch_analog.c , you have to send email to [email protected]

Node 0x02 [Audio Output] wcaps 0x30211: 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
  Control: name="IEC958 Playback Source", index=0, device=0
  Device: name="AD198x Digital", type="SPDIF", device=1
  Converter: stream=8, channel=0
  Digital: Enabled GenLevel
  Digital category: 0x2
  PCM:
    rates [0x7e0]: 44100 48000 88200 96000 176400 192000
    bits [0xe]: 16 20 24
    formats [0x5]: PCM AC3
  Delay: 3 samples

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https://bugs.launchpad.net/bugs/1015974

Title:
  [Precision WorkStation T7500, Analog Devices AD1984A, Speaker,
  Internal] No sound at all

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