Comment 5 for bug 1299549

you have to ask the author, the jack controls only have read access and no write access

any application in user space cannot change the value of the controls

control.17 {
  iface CARD
  name 'Headphone Mic Jack'
  value false
  comment {
   access read
   type BOOLEAN
   count 1
  }
 }
 control.18 {
  iface CARD
  name 'Headset Mic Phantom Jack'
  value true
  comment {
   access read
   type BOOLEAN
   count 1
  }
 }

http://bazaar.launchpad.net/~unity-settings-daemon-team/unity-settings-daemon/trunk/view/head:/plugins/media-keys/what-did-you-plug-in/pa-backend.c