Comment 94 for bug 1332900

after you have found

1) subwoofer node and which channel
2) headset mic node
3) confirm that node 0x15 is headset
4) confirm that node 0x16 is headphone

which control return true when you plug your hp into your two hp jacks ?

control.359 {
  iface CARD
  name 'Headphone Jack'
  value false
  comment {
   access read
   type BOOLEAN
   count 1
  }
 }
 control.360 {
  iface CARD
  name 'Headphone Jack'
  index 1
  value false
  comment {
   access read
   type BOOLEAN
   count 1
  }
 }

you will need to recompile the modified alsa driver