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[David Holroyd <1406034@xxxxxxxxxxxxxxxxxx>]

This may be a simple dup of #1252733, although my specific hardware is
different.

Specifically, the hda-verb invocations from comment 34 make the
background noise go away:

hda-verb /dev/snd/hwC1D0 0x0c SET_AMP_GAIN_MUTE 0x5180
hda-verb /dev/snd/hwC1D0 0x0c SET_AMP_GAIN_MUTE 0x6180

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https://bugs.launchpad.net/bugs/1406034

Title:
   XPS 15 9530, Realtek ALC3661, Black Headphone Out, Left  Background
  noise

Status in alsa-driver package in Ubuntu:
  New

Bug description:
  When listening with headphones or a headset, there's a constant
  background noise with a hiss i the left ear and 'electronic warbling'
  in the rigt ear.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.10
  Package: alsa-base 1.0.25+dfsg-0ubuntu4
  ProcVersionSignature: Ubuntu 3.16.0-28.38-generic 3.16.7-ckt1
  Uname: Linux 3.16.0-28-generic x86_64
  ApportVersion: 2.14.7-0ubuntu8
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  dave       2547 F.... pulseaudio
   /dev/snd/controlC0:  dave       2547 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Sun Dec 28 00:52:28 2014
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2013-11-30 (392 days ago)
  InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
  PackageArchitecture: all
  SourcePackage: alsa-driver
  Symptom: audio
  Symptom_AlsaPlaybackTest: ALSA playback test through plughw:PCH successful
  Symptom_Card: Built-in Audio - 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 15 9530, Realtek ALC3661, Black Headphone Out, Left] Background noise or low volume
  UpgradeStatus: Upgraded to utopic on 2014-12-21 (6 days ago)
  dmi.bios.date: 09/17/2013
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A00
  dmi.board.name: XPS 15 9530
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: Not Specified
  dmi.modalias: dmi:bvnDellInc.:bvrA00:bd09/17/2013:svnDellInc.:pnXPS159530:pvrA00:rvnDellInc.:rnXPS159530:rvrA00:cvnDellInc.:ct8:cvrNotSpecified:
  dmi.product.name: XPS 15 9530
  dmi.product.version: A00
  dmi.sys.vendor: Dell Inc.

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