if the headphone, speaker and dock line out are directly connected to
the output, it is meaning less to create those input playback volume
control

Node 0x1b [Audio Mixer] wcaps 0x20050b: Stereo Amp-In
  Control: name="Mic Playback Volume", index=0, device=0
    ControlAmp: chs=3, dir=In, idx=0, ofs=0
  Control: name="Mic Playback Switch", index=0, device=0
    ControlAmp: chs=3, dir=In, idx=0, ofs=0
  Control: name="Line Playback Volume", index=0, device=0
    ControlAmp: chs=3, dir=In, idx=2, ofs=0
  Control: name="Line Playback Switch", index=0, device=0
    ControlAmp: chs=3, dir=In, idx=2, ofs=0
  Amp-In caps: ofs=0x17, nsteps=0x1f, stepsize=0x05, mute=1
  Amp-In vals:  [0x00 0x00] [0x80 0x80] [0x03 0x03] [0x80 0x80] [0x80 0x80] 
[0x80 0x80]
  Power states: 
  Power: setting=D0, actual=D0
  Connection: 6
     0x0c 0x0e 0x0f 0x13 0x14 0x0a

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https://bugs.launchpad.net/bugs/1234814

Title:
  [HP EliteBook 8760w, IDT 92HD81B1X5] automute when plugging in
  headphones mutes master channel

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