it is bug of pulseaudio since none of the mic jack or line in support
jack detection


ports:
                analog-output-headphones: Headphones (priority 9000, available: 
unknown)
                        properties:
                                
                analog-input-microphone-front: Front Microphone (priority 8500, 
available: no)
                        properties:
                                
                analog-input-microphone-rear: Rear Microphone (priority 8200, 
available: no)
                        properties:
                                
                analog-input-linein: Line In (priority 8100, available: yes)
                        properties:
                                


Node 0x18 [Pin Complex] wcaps 0x40018f: Stereo Amp-In Amp-Out
  Control: name="Rear Mic Boost Volume", index=0, device=0
    ControlAmp: chs=3, dir=In, idx=0, ofs=0
  Control: name="Rear Mic Jack", index=0, device=0
  Amp-In caps: ofs=0x00, nsteps=0x03, stepsize=0x27, mute=0
  Amp-In vals:  [0x00 0x00]
  Amp-Out caps: ofs=0x00, nsteps=0x00, stepsize=0x00, mute=1
  Amp-Out vals:  [0x80 0x80]
  Pincap 0x00001734: IN OUT Detect
    Vref caps: HIZ 50 GRD 80
  Pin Default 0x01a19930: [Jack] Mic at Ext Rear
    Conn = 1/8, Color = Pink
    DefAssociation = 0x3, Sequence = 0x0
    Misc = NO_PRESENCE
  Pin-ctls: 0x24: IN VREF_80
  Unsolicited: tag=03, enabled=1
  Connection: 1
     0x0e
Node 0x19 [Pin Complex] wcaps 0x40018f: Stereo Amp-In Amp-Out
  Control: name="Front Mic Boost Volume", index=0, device=0
    ControlAmp: chs=3, dir=In, idx=0, ofs=0
  Control: name="Front Mic Jack", index=0, device=0
  Amp-In caps: ofs=0x00, nsteps=0x03, stepsize=0x27, mute=0
  Amp-In vals:  [0x00 0x00]
  Amp-Out caps: ofs=0x00, nsteps=0x00, stepsize=0x00, mute=1
  Amp-Out vals:  [0x80 0x80]
  Pincap 0x0000173c: IN OUT HP Detect
    Vref caps: HIZ 50 GRD 80
  Pin Default 0x02a19931: [Jack] Mic at Ext Front
    Conn = 1/8, Color = Pink
    DefAssociation = 0x3, Sequence = 0x1
    Misc = NO_PRESENCE
  Pin-ctls: 0x24: IN VREF_80
  Unsolicited: tag=04, enabled=1
  Connection: 2
     0x0c* 0x0e
Node 0x1a [Pin Complex] wcaps 0x40018d: Stereo Amp-Out
  Control: name="Line Jack", index=0, device=0
  Amp-Out caps: ofs=0x00, nsteps=0x00, stepsize=0x00, mute=1
  Amp-Out vals:  [0x80 0x80]
  Pincap 0x00000034: IN OUT Detect
  Pin Default 0x0181313f: [Jack] Line In at Ext Rear
    Conn = 1/8, Color = Blue
    DefAssociation = 0x3, Sequence = 0xf
    Misc = NO_PRESENCE
  Pin-ctls: 0x20: IN
  Unsolicited: tag=05, enabled=1
  Connection: 1
     0x0d


** Also affects: pulseaudio (Ubuntu)
   Importance: Undecided
       Status: New

** Changed in: pulseaudio (Ubuntu)
       Status: New => Confirmed

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https://bugs.launchpad.net/bugs/970225

Title:
  [Phoenix Broadwater, Realtek ALC662 rev 1] Microphone not working from
  front jack

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