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[Raymond <1302090@xxxxxxxxxxxxxxxxxx>]

https://git.kernel.org/cgit/linux/kernel/git/tiwai/sound.git/commit/sound/pci/hda/patch_realtek.c?id=76c2132ec9805120eb724cae4d2a8d30af27b3fd


the introduction of snd_hda_pin_quirk automatically fix some pin default based on the bios pin defaults 

not sure those quirks have any impact when you perform some test since
those quirk perform fixup silently without any message on system log

the bass speaker playback volume only appear when there are two speaker
pin complex and DAC assign to speaker first instead of headphone,

i.e. either two headphone jacks share same DAC

or

need to implement  "Speaker+HP" playback volume as the driver try to
avoid this kind of sharing volume control

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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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