Pin Default 0x02214c20: [Jack] HP Out at Ext Front
    Conn = 1/8, Color = Green
    DefAssociation = 0x2, Sequence = 0x0


you can use hda-verb to set bit 8 of pin default of the front headphone
to disable the unsolicited event

0x02214d20

  misc = NO_PRESENCE

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https://bugs.launchpad.net/bugs/1067434

Title:
  Sound output device keeps changing when using headphones

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