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[Gabriele <1252733@xxxxxxxxxxxxxxxxxx>]

I got a headset and tried it, no autodetection:
     sound hdaudioC1D0: Headset jack set to headphone (default) mode.


Regarding 0x19, I guess you are right and it's required for microphones, but I don't have one to test.

Anyway, the pop noise is heard when switching between these two (Node 0x19):
Pin-ctls: 0x21: IN VREF_50
Pin-ctls: 0x20: IN VREF_HIZ

VREF_50 is used with microphones, VREF_HIZ with headphones and headset.

The pop noise is not a big deal, is heard only once on boot and it's not
that loud.

-- 
You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to alsa-driver in Ubuntu.
https://bugs.launchpad.net/bugs/1252733

Title:
  [XPS 12-9Q33, Realtek ALC668, Black Headphone Out, Left] Background
  noise or low volume

Status in “alsa-driver” package in Ubuntu:
  Incomplete

Bug description:
  When listening to sound on my laptop through headphones, there's a
  constant background hiss (which disappears only when all sound has
  been stopped for a few seconds. power saving I guess).

  I also need to turn the volume *way* down to 10% for the sound volume
  to be reasonable (it's way too loud otherwise).

  ProblemType: Bug
  DistroRelease: Ubuntu 13.10
  Package: alsa-base 1.0.25+dfsg-0ubuntu4
  ProcVersionSignature: Ubuntu 3.11.0-13.20-generic 3.11.6
  Uname: Linux 3.11.0-13-generic x86_64
  ApportVersion: 2.12.5-0ubuntu2.1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  martijn    2130 F.... pulseaudio
   /dev/snd/pcmC1D0p:   martijn    2130 F...m pulseaudio
   /dev/snd/controlC0:  martijn    2130 F.... pulseaudio
  Date: Tue Nov 19 14:26:46 2013
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2013-11-13 (6 days ago)
  InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
  MarkForUpload: True
  PackageArchitecture: all
  SourcePackage: alsa-driver
  Symptom: audio
  Symptom_AlsaPlaybackTest: ALSA playback test through plughw:PCH successful
  Symptom_Card: Intern geluid - HDA Intel PCH
  Symptom_Jack: Black Headphone Out, Left
  Symptom_PulsePlaybackTest: PulseAudio playback test successful
  Symptom_Type: High background noise, or volume is too low
  Title: [XPS 12-9Q33, Realtek ALC668, Black Headphone Out, Left] Background noise or low volume
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 09/24/2013
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A03
  dmi.board.name: XPS 12-9Q33
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A03
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: Not Specified
  dmi.modalias: dmi:bvnDellInc.:bvrA03:bd09/24/2013:svnDellInc.:pnXPS12-9Q33:pvrA03:rvnDellInc.:rnXPS12-9Q33:rvrA03:cvnDellInc.:ct8:cvrNotSpecified:
  dmi.product.name: XPS 12-9Q33
  dmi.product.version: A03
  dmi.sys.vendor: Dell Inc.

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