Misc[3:0] is a bit field used to indicate other information about the jack. 
Currently, only bit 0 is
defined. If bit 0 is set, it indicates that the jack has no presence detect 
capability, so even if a Pin
Complex indicates that the codec hardware supports the presence detect 
functionality on the jack,
the external circuitry is not capable of supporting the functionality. 

  Pin Default 0x02214120: [Jack] HP Out at Ext Front
    Conn = 1/8, Color = Green
    DefAssociation = 0x2, Sequence = 0x0
    Misc = NO_PRESENCE   <---- This mean that your set the front panel type to 
ac97 in BIOS 


 Unsolicited: tag=00, enabled=0

The driver did not enable the unsolicited event of  the headphone pin

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https://bugs.launchpad.net/bugs/871582

Title:
  M4A89GTD_PRO_USB3/Realtek ALC892, Green Headphone Out, Front] Playback
  problem

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