the case are different if you have laptop with different codecs,

pulseaudio require driver to provide jack detection control since ubuntu
12.04

  Control: name="Headphone Jack", index=0, device=0

  iface CARD
  name 'Headphone Jack'
  value false
  comment {
   access read
   type BOOLEAN
   count 1
  }

your ad1984a are not using latest alsa driver and does not have
headphone jack and mic jack detection control

post

pactl list

for your laptop with different codec

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https://bugs.launchpad.net/bugs/1254884

Title:
  Pulseaudio: incoherent muting of GStreamer channels (mutes master,
  headphone and speaker, but unmutes only master)

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