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[Raymond <1302090@xxxxxxxxxxxxxxxxxx>]

driver seem hardcode to use first pin spec->gen.autocfg.hp_pins[0] as hp
of the headset

and imux_pin to determine the selected mic

this mean that if you set the correct pin default of headset mic
(headset mic phantom jack)

you can select  internal mic, headset mic or mic jack manually using the
capture source control


static void alc_update_headset_mode(struct hda_codec *codec)
{
	struct alc_spec *spec = codec->spec;

	hda_nid_t mux_pin = spec->gen.imux_pins[spec->gen.cur_mux[0]];
	hda_nid_t hp_pin = spec->gen.autocfg.hp_pins[0];

        int new_headset_mode;

	if (!snd_hda_jack_detect(codec, hp_pin))
		new_headset_mode = ALC_HEADSET_MODE_UNPLUGGED;
	else if (mux_pin == spec->headset_mic_pin)
		new_headset_mode = ALC_HEADSET_MODE_HEADSET;
	else if (mux_pin == spec->headphone_mic_pin)
		new_headset_mode = ALC_HEADSET_MODE_MIC;
	else
		new_headset_mode = ALC_HEADSET_MODE_HEADPHONE;

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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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