it mainly depend on the number of volume controls and mute switches in
the hda codec
you have to post the output of alsa-info.sh

1) Two channels hda codec (e.g.  ad1984, ...)
2) Four channels hda codecs which support 2+2 (e.g alc26x, ad1983,.. ) 
3) Six channels hda codecs (e.g. ad1986, alc66x,..).
4)Eight channels hda codecs(e.g vt1708s, ....)
5)10 channels hda codecs support 7.1+2 (e.g alc88x, ad1988, ....)

** Changed in: pulseaudio (Ubuntu)
       Status: New => Incomplete

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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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