use alsamixer to change two speaker playback volume and switches and find out 
which node 0x0d or 0x0f is the real internal speaker

if there is only stereo speaker and no subwoofer.
you need to a pin fixup to the pin default of  non exist speaker node from 
[Fixed] to [N/A]


Node 0x0d [Pin Complex] wcaps 0x400501: Stereo
   Pincap 0x00010050: OUT EAPD Balanced
   EAPD 0x2: EAPD
   Pin Default 0x92170110: [Fixed] Speaker at Int Front
     Conn = Analog, Color = Unknown
     DefAssociation = 0x1, Sequence = 0x0
     Misc = NO_PRESENCE
   Pin-ctls: 0x00:
   Power: setting=D0, actual=D0
   Connection: 3
      0x13* 0x14 0x1c

Node 0x0f [Pin Complex] wcaps 0x400583: Stereo Amp-In
   Amp-In caps: N/A
   Amp-In vals: [0x00 0x00]
   Pincap 0x00010034: IN OUT EAPD Detect
   EAPD 0x2: EAPD
   Pin Default 0x92170110: [Fixed] Speaker at Int Front
     Conn = Analog, Color = Unknown
     DefAssociation = 0x1, Sequence = 0x0
     Misc = NO_PRESENCE
   Pin-ctls: 0x00:
   Unsolicited: tag=00, enabled=0
   Power: setting=D0, actual=D0
   Connection: 3
      0x13 0x14* 0x1c

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https://bugs.launchpad.net/bugs/1087953

Title:
  connecting headphones mutes sound after latest updates on Pavilion dv6
  laptop

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