refer to 92hd75 datasheet

port A is the only output which support HP


Port Functionality Single function (Input only / output only) ports allow for 
the highest possible performance. •Port A supports • Headphone Out • Line Out
 •Ports B and C support •Line In •Mic with0/10/20/30/40 dB boost
 • Port D supports •Line Out
 •Port E supports •Line In •Mic with0/10/20/30/40 dB boost 
•Port F supports (48  version only) •Line Out



Node 0x0a [Pin Complex] wcaps 0x400181: Stereo
  Pincap 0x0000001c: OUT HP Detect
  Pin Default 0x40f100f0: [N/A] Other at Ext N/A
    Conn = 1/8, Color = Unknown
    DefAssociation = 0xf, Sequence = 0x0
  Pin-ctls: 0x00:
  Unsolicited: tag=00, enabled=0
  Connection: 3
     0x10 0x11 0x17*


try hda-verb

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https://bugs.launchpad.net/bugs/870360

Title:
  [HP Pavilion dv7 Notebook PC, IDT 92HD75B3X5, Internal] Speakers not
  disabled when headphone jack plugged in

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