Default Association and Sequence are used together by software to group
Pin Complexes (and therefore jacks) together into functional blocks to
support multichannel operation.  Software may assume that all jacks with
the same association number are intended to be grouped together, for
instance to provide six channel analog output.  The Default Association
can also be used by software to prioritize resource allocation in
constrained situations.  Lower Default Association values would be
higher in priority for resources such as processing nodes or Input and
Output Converters.

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https://bugs.launchpad.net/bugs/1302090

Title:
  Dell Alienware 14, Speaker sound output is mono until a headphone jack
  is plugged

Status in “alsa-driver” package in Ubuntu:
  New

Bug description:
  Here's the required release and package information:

      Description:    Ubuntu Trusty Tahr (development branch)
      Release:        14.04

      Package: linux-image-extra-3.13.0-19-generic
      Version: 3.13.0-19.40

  When playing audio through speakers on my Alienware 14 2014, the sound
  output is in mono until I plug a headphone in any of the two available
  headphone jacks (obviously, the auto-mute option must be disabled).
  When I do so, the sound starts to play in stereo.

  I would love the sound output to be stereo by default and not be
  forced to plug anything to achieve that.

  Attached is the alsa-info.sh output for my machine.

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