Comment 10 for bug 1274401

there are only two amp out in two audio output 0x08 and 0x9 but there are three output pin complex (speaker, subwoofer and headphone)

this mean that some output must share the volume control'

pactl list

https://wiki.ubuntu.com/PulseAudio/Log

Node 0x08 [Audio Output] wcaps 0x41d: Stereo Amp-Out
  Control: name="Front Playback Volume", index=0, device=0
    ControlAmp: chs=3, dir=Out, idx=0, ofs=0
  Device: name="VT1802 Analog", type="Audio", device=0
  Device: name="VT1802 Alt Analog", type="Audio", device=2
  Amp-Out caps: ofs=0x2a, nsteps=0x2a, stepsize=0x05, mute=0
  Amp-Out vals: [0x10 0x10]
  Converter: stream=8, channel=0
  PCM:
    rates [0x5e0]: 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
Node 0x09 [Audio Output] wcaps 0x41d: Stereo Amp-Out
  Control: name="Bass Speaker Playback Volume", index=0, device=0
    ControlAmp: chs=3, dir=Out, idx=0, ofs=0
  Amp-Out caps: ofs=0x2a, nsteps=0x2a, stepsize=0x05, mute=0
  Amp-Out vals: [0x10 0x10]
  Converter: stream=8, channel=0
  PCM:
    rates [0x5e0]: 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