Comment 10 for bug 1516025

control.17 {
  iface CARD
  name 'Headphone Front Jack'
  value false
  comment {
   access read
   type BOOLEAN
   count 1
  }
 }
 control.18 {
  iface CARD
  name 'Headphone Surround Jack'
  value false
  comment {
   access read
   type BOOLEAN
   count 1
  }
 }

it is strange that headphone availability is unknown when both headphone jacks are not plugged

ports:
  analog-output-speaker: Speakers (priority 10000, latency offset 0 usec, available: unknown)
   properties:
    device.icon_name = "audio-speakers"
  analog-output-headphones: Headphones (priority 9000, latency offset 0 usec, available: unknown)
   properties:
    device.icon_name = "audio-headphones"
 active port: <analog-output-speaker>