Comment 2 for bug 1442428

ports:
  analog-output-lineout: Line Out (priority 9900, latency offset 0 usec, available: yes)
   properties:

  analog-output-headphones: Headphones (priority 9000, latency offset 0 usec, available: yes)
   properties:
    device.icon_name = "audio-headphones"
 active port: <analog-output-lineout>

seem both line out and headphone are available but line out has higher priority