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[Raymond <1302090@xxxxxxxxxxxxxxxxxx>]

did you hear sound from subwoofer for both left and right channel , or
only from one channel


speaker-test -c2 -t wav -D hw:0,0

speaker-test -c4 -t wav -D hw:0,0

do you hear only low frequency from the subwoofer ?


alc668 does not have any mono pin complex nor mono audio mixer for
downmixing

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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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