Comment 49 for bug 1225789

Node 0x1f [Pin Complex] wcaps 0x40010d: Stereo Amp-Out
  Control: name="PCM Playback Volume", index=0, device=0
    ControlAmp: chs=3, dir=Out, idx=0, ofs=0
  Control: name="PCM Playback Switch", index=0, device=0
    ControlAmp: chs=3, dir=Out, idx=0, ofs=0
  Control: name="Speaker Jack", index=0, device=0
  Amp-Out caps: ofs=0x1b, nsteps=0x1b, stepsize=0x06, mute=1
  Amp-Out vals: [0x1b 0x1b]
  Pincap 0x0000001c: OUT HP Detect
  Pin Default 0x110140f0: [Jack] Line Out at Int Rear
    Conn = 1/8, Color = Green
    DefAssociation = 0xf, Sequence = 0x0
  Pin-ctls: 0x40: OUT
  Connection: 1
     0x17

it should be speaker phantom Jack since internal speaker is always connected

PCM Playback switch is defined in the common path of pulseaudio

http://cgit.freedesktop.org/pulseaudio/pulseaudio/tree/src/modules/alsa/mixer/paths/analog-output.conf.common

[Element PCM]
switch = mute
volume = merge
override-map.1 = all
override-map.2 = all-left,all-right