http://cgit.freedesktop.org/pulseaudio/pulseaudio/commit/src/modules/alsa/mixer/paths
/analog-output-
headphones.conf?id=594da41d07edcebc5fd319388852a66cc3f12ace


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

if it is dock line out, look like you need to add


 
[Jack Dock Line Out]
required-any = any


otherwise you need to use hdajackretask to change dock line out to dock 
headphone


http://voices.canonical.com/david.henningsson/2011/11/29/turn-your-mic-jack-into-a-headphone-jack/

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https://bugs.launchpad.net/bugs/1464321

Title:
  No sound output through docking station headphones jack for Dell
  Latitude E5450

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