You can change change lineout.conf since you don`t need change volume to zero 
when you alreadt mute playback switch, this allow HP volume remain unchange 
 
 [Element Headphone]
-switch = off
+switch=mute
-volume = off

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https://bugs.launchpad.net/bugs/1518289

Title:
  front headphone jack recognised by alsa but ignored by pulseaudio

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