Comment 2 for bug 1256511

 control.34 {
  iface CARD
  name 'Line Out Front Jack'
  value true
  comment {
   access read
   type BOOLEAN
   count 1
  }
 }

 active profile: <output:hdmi-stereo>
 sinks:
  alsa_output.pci-0000_00_1b.0.hdmi-stereo/#0: Built-in Audio Digital Stereo (HDMI)
 sources:
  alsa_output.pci-0000_00_1b.0.hdmi-stereo.monitor/#1: Monitor of Built-in Audio Digital Stereo (HDMI)
 ports:
  analog-input-microphone-front: Front Microphone (priority 8500, latency offset 0 usec, available: no)
   properties:
    device.icon_name = "audio-input-microphone"
  analog-input-microphone-rear: Rear Microphone (priority 8200, latency offset 0 usec, available: no)
   properties:
    device.icon_name = "audio-input-microphone"
  analog-input-linein: Line In (priority 8100, latency offset 0 usec, available: no)
   properties:

  analog-output: Analog Output (priority 9900, latency offset 0 usec, available: unknown)
   properties:

  analog-output-headphones: Headphones (priority 9000, latency offset 0 usec, available: no)
   properties:
    device.icon_name = "audio-headphones"
  hdmi-output-0: HDMI / DisplayPort (priority 5900, latency offset 0 usec, available: yes)
   properties:
    device.icon_name = "video-display"
    device.product.name = "SAMSUNG"

do you mean pulseaudio select hdmi automatically even speaker is plugged into Line Out jack ?

http://cgit.freedesktop.org/pulseaudio/pulseaudio/commit/src/modules/alsa/mixer/paths/analog-output-lineout.conf?id=ecf3ab2b5788c85c237eeb6429bd1d525b9ac0cc

https://bugs.freedesktop.org/enter_bug.cgi?product=PulseAudio