Comment 6 for bug 1508092

control.8 {
  iface MIXER
  name 'Capture Source'
  value 'Internal Mic'
  comment {
   access 'read write'
   type ENUMERATED
   count 1
   item.0 'Internal Mic'
   item.1 'Headphone Mic'
  }
 }

if netbook audio jack support either headphone or mic, the role of the jack is changed by capture source

there is no headphone jack kctl which pulseaudio use to mute speaker

control.16 {
  iface CARD
  name 'Headphone Mic Jack'
  value false
  comment {
   access read
   type BOOLEAN
   count 1
  }
 }