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[Raymond <1315770@xxxxxxxxxxxxxxxxxx>]

http://en.community.dell.com/support-forums/software-
os/f/3525/t/19563481

do jayfree 's solution fix the problem ?

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https://bugs.launchpad.net/bugs/1315770

Title:
  [Dell Precision M3800, Realtek ALC668, Black Headphone Out, Left]
  Strong background noise

Status in Dell Sputnik:
  New
Status in alsa-driver package in Ubuntu:
  Confirmed
Status in Fedora:
  New

Bug description:
  When I connect the headphones, there is a strong hissing in both left
  and right side. It does not amplify or reduce along with the master
  volume. Instead, if I completely mute the master volume, the hissing
  disappears. It comes back as soon as I unmute the master volume.

  The internal speakers of the laptop are not affected: when headphones
  are not connected, there is no background hissing noise.

  Standard four questions:
  1) Ubuntu release: 14.04 LTS
  2) Package affected: kernel? (linux-image-3.13.0-24-generic) or maybe alsa-driver?
  3) Unless I play music, I expect no to hear anything in the headphones
  4) I get a background hissing noise in the headphones

  Thanks!

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: alsa-base 1.0.25+dfsg-0ubuntu4
  ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9
  Uname: Linux 3.13.0-24-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  sun        1875 F.... pulseaudio
   /dev/snd/controlC1:  sun        1875 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Sun May  4 02:46:01 2014
  InstallationDate: Installed on 2014-05-02 (1 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  PackageArchitecture: all
  SourcePackage: alsa-driver
  Symptom: audio
  Symptom_AlsaPlaybackTest: ALSA playback test through plughw:PCH successful
  Symptom_Card: Audio interne - 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: [Dell Precision M3800, Realtek ALC668, Black Headphone Out, Left] Background noise or low volume
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 02/06/2014
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A03
  dmi.board.name: Dell Precision M3800
  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:bd02/06/2014:svnDellInc.:pnDellPrecisionM3800:pvrA03:rvnDellInc.:rnDellPrecisionM3800:rvrA03:cvnDellInc.:ct8:cvrNotSpecified:
  dmi.product.name: Dell Precision M3800
  dmi.product.version: A03
  dmi.sys.vendor: Dell Inc.

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