the driver did not create exrternal mic capture volume and capture switch at node 0x14

pulseaudio mute the other input source (e.g. dock mic and internal mic) but the driver share node 0x17 for dock mic and external mic

you need to rewrite the driver to use node 0x18 for external mic boost

the workaound is change the pulseaudio 's ext mic conf so that it won't mute the dock mic

Node 0x14 [Audio Input] wcaps 0x100d1b: Stereo Amp-In R/L
  Control: name="Dock Mic Capture Volume", index=0, device=0
    ControlAmp: chs=3, dir=In, idx=0, ofs=0
  Control: name="Dock Mic Capture Switch", index=0, device=0
    ControlAmp: chs=3, dir=In, idx=0, ofs=0
  Control: name="Internal Mic Capture Volume", index=0, device=0
    ControlAmp: chs=3, dir=In, idx=2, ofs=0
  Control: name="Internal Mic Capture Switch", index=0, device=0
    ControlAmp: chs=3, dir=In, idx=2, ofs=0
  Device: name="CONEXANT Analog", type="Audio", device=0
  Amp-In caps: ofs=0x4a, nsteps=0x50, stepsize=0x03, mute=1
  Amp-In vals:  [0x80 0x80] [0x4a 0x4a] [0x80 0x80] [0x4a 0x4a]
  Converter: stream=4, channel=0
  SDI-Select: 0
  PCM:
    rates [0x160]: 44100 48000 96000
    bits [0xe]: 16 20 24
    formats [0x1]: PCM
  Power states:  D0 D1 D2 D3 D3cold
  Power: setting=D0, actual=D0
  Connection: 4
     0x17* 0x18 0x23 0x24

Node 0x17 [Audio Selector] wcaps 0x30050d: Stereo Amp-Out
  Control: name="Dock Mic Boost Volume", index=0, device=0
    ControlAmp: chs=3, dir=Out, idx=0, ofs=0
  Amp-Out caps: ofs=0x00, nsteps=0x04, stepsize=0x27, mute=0
  Amp-Out vals:  [0x00 0x00]
  Power states:  D0 D1 D2 D3 D3cold
  Power: setting=D0, actual=D0
  Connection: 4
     0x1a 0x1b* 0x1d 0x1e
Node 0x18 [Audio Selector] wcaps 0x30050d: Stereo Amp-Out
  Amp-Out caps: ofs=0x00, nsteps=0x04, stepsize=0x27, mute=0
  Amp-Out vals:  [0x00 0x00]
  Power states:  D0 D1 D2 D3 D3cold
  Power: setting=D0, actual=D0
  Connection: 4
     0x1a* 0x1b 0x1d 0x1e

Node 0x1a [Pin Complex] wcaps 0x400481: Stereo
  Control: name="Dock Mic Jack", index=0, device=0
  Pincap 0x00001324: IN Detect
    Vref caps: HIZ 50 80
  Pin Default 0x21a190f0: [Jack] Mic at Sep Rear
    Conn = 1/8, Color = Pink
    DefAssociation = 0xf, Sequence = 0x0
  Pin-ctls: 0x24: IN VREF_80
  Unsolicited: tag=04, enabled=1
  Power states:  D0 D1 D2 D3 D3cold
  Power: setting=D0, actual=D0
Node 0x1b [Pin Complex] wcaps 0x400581: Stereo
  Control: name="Mic Jack", index=0, device=0
  Pincap 0x00011334: IN OUT EAPD Detect
    Vref caps: HIZ 50 80
  EAPD 0x2: EAPD
  Pin Default 0x04a190f0: [Jack] Mic at Ext Right
    Conn = 1/8, Color = Pink
    DefAssociation = 0xf, Sequence = 0x0
  Pin-ctls: 0x24: IN VREF_80
  Unsolicited: tag=03, enabled=1
  Power states:  D0 D1 D2 D3 D3cold
  Power: setting=D0, actual=D0
  Connection: 2
     0x10* 0x11

Node 0x23 [Pin Complex] wcaps 0x40040b: Stereo Amp-In
  Control: name="Internal Mic Boost Volume", index=0, device=0
    ControlAmp: chs=3, dir=In, idx=0, ofs=0
  Amp-In caps: ofs=0x00, nsteps=0x04, stepsize=0x2f, mute=0
  Amp-In vals:  [0x00 0x00]
  Pincap 0x00000020: IN
  Pin Default 0x90a601f0: [Fixed] Mic at Int N/A
    Conn = Digital, Color = Unknown
    DefAssociation = 0xf, Sequence = 0x0
    Misc = NO_PRESENCE
  Pin-ctls: 0x20: IN
  Power states:  D0 D1 D2 D3 D3cold
  Power: setting=D0, actual=D0