if the user manual mention that it support headset, headphone and Mic,

removing 0x19 is just a dirty workaround since HP Jack support OUT and
not support IN

seem really use 0x19 for Mic jack


Node 0x15 [Pin Complex] wcaps 0x40058d: Stereo Amp-Out
  Control: name="Headphone Playback Switch", index=0, device=0
    ControlAmp: chs=3, dir=Out, idx=0, ofs=0
  Control: name="Headphone Jack", index=0, device=0
  Amp-Out caps: ofs=0x00, nsteps=0x00, stepsize=0x00, mute=1
  Amp-Out vals:  [0x00 0x00]
  Pincap 0x0001001c: OUT HP EAPD Detect
  EAPD 0x2: EAPD
  Pin Default 0x0321101f: [Jack] HP Out at Ext Left
    Conn = 1/8, Color = Black
    DefAssociation = 0x1, Sequence = 0xf
  Pin-ctls: 0xc0: OUT HP
  Unsolicited: tag=01, enabled=1
  Power states:  D0 D1 D2 D3 EPSS
  Power: setting=D0, actual=D0
  Connection: 3
     0x0c* 0x0d 0x0e

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https://bugs.launchpad.net/bugs/1252733

Title:
  [XPS 12-9Q33, Realtek ALC668, Black Headphone Out, Left] Background
  noise or low volume

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