Comment 85 for bug 1332900

(In reply to Gary from comment #1)
> I should add too
> The sound through Headphones works perfectly

are you sure that both headphone work perfectly

http://cgit.freedesktop.org/pulseaudio/pulseaudio/tree/src/modules/alsa/mixer/paths

there are headphones.conf and headphone2.conf

but you don't have Headphone2 Playback Volume/Switch

control.343 {
  iface MIXER
  name 'Headphone Playback Volume'
  value.0 87
  value.1 87
  comment {
   access 'read write'
   type INTEGER
   count 2
   range '0 - 87'
   dbmin -6525
   dbmax 0
   dbvalue.0 0
   dbvalue.1 0
  }
 }
 control.344 {
  iface MIXER
  name 'Headphone Playback Switch'
  value.0 true
  value.1 true
  comment {
   access 'read write'
   type BOOLEAN
   count 2
  }
 }
 control.345 {
  iface MIXER
  name 'Headphone Playback Volume'
  index 1
  value.0 87
  value.1 87
  comment {
   access 'read write'
   type INTEGER
   count 2
   range '0 - 87'
   dbmin -6525
   dbmax 0
   dbvalue.0 0
   dbvalue.1 0
  }
 }
 control.346 {
  iface MIXER
  name 'Headphone Playback Switch'
  index 1
  value.0 true
  value.1 true
  comment {
   access 'read write'
   type BOOLEAN
   count 2
  }
 }