https://git.kernel.org/cgit/linux/kernel/git/tiwai/sound.git/plain/Documentation/sound/alsa
/HD-Audio.txt

 jack_detect (bool): specify whether the jack detection is available
   at all on this machine; default true
 - trigger_sense (bool): indicates that the jack detection needs the
   explicit call of AC_VERB_SET_PIN_SENSE verb

or

set Misc Bit (bit 8) of pin default of headphone to not enable jack
detection

Misc = NO_PRESENCE


Node 0x1b [Pin Complex] wcaps 0x40018f: Stereo Amp-In Amp-Out
  Control: name="Headphone Playback Switch", index=0, device=0
    ControlAmp: chs=3, dir=Out, idx=0, ofs=0
  Control: name="Front Headphone 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:  [0x00 0x00]
  Pincap 0x0000373e: IN OUT HP Detect Trigger
    Vref caps: HIZ 50 GRD 80 100
  Pin Default 0x02214c20: [Jack] HP Out at Ext Front
    Conn = 1/8, Color = Green
    DefAssociation = 0x2, Sequence = 0x0
  Pin-ctls: 0xc0: OUT HP VREF_HIZ
  Unsolicited: tag=01, enabled=1
  Connection: 5
     0x0c 0x0d 0x0e 0x0f 0x26*

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https://bugs.launchpad.net/bugs/1063965

Title:
  Choppy sound in 12.10

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