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[Raymond <1302090@xxxxxxxxxxxxxxxxxx>]

how did you set the pin default of subwoofer ?


  Pin Default 0x90170111: [Fixed] Speaker at Int N/A
    Conn = Analog, Color = Unknown
    DefAssociation = 0x1, Sequence = 0x1
 Misc = NO_PRESENCE



  subwoofer may use same DAC if  there is low pass filter, 

did your hear sound from speaker  and subwoofet ?

spk_outs = 14/18/0/0 : 4/4/0/0
  spk path: depth=3 '04:0e:14'
  spk path: depth=3 '04:0e:18'

you need four channels and software low pass filter only when there is
no hardware low pass filter

multi_outs = 14/18/0/0 : 2/3/0/0 (type SP)
  out path: depth=3 '02:0c:14'
  out path: depth=3 '03:0d:18'

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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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