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[Raymond <1406034@xxxxxxxxxxxxxxxxxx>]

do you mean mute those connection from audio mixer 0x0b ?


Node 0x0c [Audio Mixer] wcaps 0x20010b: Stereo Amp-In
  Amp-In caps: ofs=0x00, nsteps=0x00, stepsize=0x00, mute=1
  Amp-In vals:  [0x00 0x00] [0x00 0x00]
  Connection: 2
     0x02 0x0b


you need to file an upatream bug report if you want driver to add "loopback playback switch " to mute those connectuon from node 0x0b in those node 0x0c, 0x0d,...


Node 0x0b [Audio Mixer] wcaps 0x20010b: Stereo Amp-In
  Control: name="Headphone Mic Playback Volume", index=0, device=0
    ControlAmp: chs=3, dir=In, idx=1, ofs=0
  Control: name="Headphone Mic Playback Switch", index=0, device=0
    ControlAmp: chs=3, dir=In, idx=1, ofs=0
  Control: name="Headset Mic Playback Volume", index=0, device=0
    ControlAmp: chs=3, dir=In, idx=3, ofs=0
  Control: name="Headset Mic Playback Switch", index=0, device=0
    ControlAmp: chs=3, dir=In, idx=3, ofs=0
  Control: name="Beep Playback Volume", index=0, device=0
    ControlAmp: chs=3, dir=In, idx=4, ofs=0
  Control: name="Beep Playback Switch", index=0, device=0
    ControlAmp: chs=3, dir=In, idx=4, ofs=0
  Amp-In caps: ofs=0x17, nsteps=0x1f, stepsize=0x05, mute=1
  Amp-In vals:  [0x80 0x80] [0x80 0x80] [0x80 0x80] [0x80 0x80] [0x80 0x80] [0x80 0x80]
  Connection: 6
     0x18 0x19 0x1a 0x1b 0x1d 0x14

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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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