do suvpbwoofer really work since both speaker and subwoofer connect to
same audio output ?


to add volume controls to speaker and subwoofer ,

either use hda Jack retask to remove one headphone jack

or

modify driver to increase badness when there are two headphone Jacks and
two speaker pins ,but only three audio output when cfg->line_out_type ==
auto_pin_hp_out since Def assoc of second headphone Jack is larger than
that of subwoofer (lower priority to assign volume control/audio output
)

this force driver to assign audio output/volume control to two speakers
first

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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:
  Confirmed

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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