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[Guy <1302090@xxxxxxxxxxxxxxxxxx>]

Finally finally finally I got that salad to work but not the same way,
here the details :

In fact they are to pins disconnected that I had to connect, the 0x1a
and THE 0x18, the connections in hdajackretask are now :

0x1a = Line out (back)
0x18 = (Center/LFE)

Which gives in alsamixer :

Master = Master fonction.
Headphone (Headphone) = Adjustable volume for the headphone jack (first one).
Headphone (Headphone 1) = [00] Not adjustable (probably the headset jack ?).
Speaker (Speaker) = [00] Not adjustable.
Front (Front) = Adjustable and corresponding to front speakers (if on 00 you ear only the subwoofer).
Surround (Surround) = seems to correspond to the subwoofer (if on 00 you ear high front frequency).
Mic (Mic) = Mic adjustable.
Mic Boost (Mic Boost) = Adjustable but no idee what for.
Auto-Mute (Auto-mute Mode) > (line out, speaker, disable) = If line out selected it mute all speakers, if speaker selected it mute only the "tweeters" but the subwoofer is still active.

So I hope that it will be usefull to others that were fyghting to get
that "crap" working.

P.S. I didn't try if the headset nor mic are fonctionnal but the
headphone are, no problem.

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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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