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[Guy <1302090@xxxxxxxxxxxxxxxxxx>]

I install buntu 14.04.2 and pulseaudio (before only alsa) but it's still
the same, need to plug the headphones to get the "subwoofer" working.
With pulse is even a bigger mess, which where what..!

uname -r
3.13.0-46-generic

cat /proc/asound/version
Advanced Linux Sound Architecture Driver Version k3.13.0-46-generic.

 cat /proc/asound/cards                                        
 0 [HDMI           ]: HDA-Intel - HDA Intel HDMI
                      HDA Intel HDMI at 0xd2710000 irq 47
 1 [PCH            ]: HDA-Intel - HDA Intel PCH
                      HDA Intel PCH at 0xd2714000 irq 48

Alienware... A real human crap !

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Packages, which is subscribed to alsa-driver in Ubuntu.
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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