** Also affects: libmatemixer (Ubuntu)
   Importance: Undecided
       Status: New

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  [Latitude 3340, Realtek ALC3234] MATE - Headphone Static on Battery

Status in alsa-driver package in Ubuntu:
Status in libmatemixer package in Ubuntu:

Bug description:
  I have noticed that when I am on battery power on a Dell Latitude 3340
  laptop with headphones plugged in , and there is no audio playing on
  the computer, there is a consistent static sound that comes through
  the headphones at a constant volume that is not affected by changing
  the volume level. I think it may be picking up some kind of analog
  loopback signal because keyboard presses and disk activity seem to
  influence the noise. When I plug the power cable into the laptop , the
  static immediately goes away.

  I reported this earlier to the upstream Linux Kernel bug tracker, but
  it seems to be fixed in any distro running a 4.4 kernel or greater
  that I have tested , Except for Ubuntu MATE 16.04 LTS 64-bit. This
  make me think it is not a kernel level issue and is found somewhere
  either in the audio settings on Ubuntu MATE or a pulseaudio bug. I
  cannot reproduce it on any other 16.04 distro version, but it also
  affects all the 14.04.4 distros as well.

  Running amixer -c 1 set "Loopback Mixing" "Disabled" does not prevent
  the static.

  The BIOS Firmware version is up to date.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: pulseaudio 1:8.0-0ubuntu3
  ProcVersionSignature: Ubuntu 4.4.0-21.37-generic 4.4.6
  Uname: Linux 4.4.0-21-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2
  Architecture: amd64
   /dev/snd/controlC1:  ubuntu-mate   1718 F.... pulseaudio
   /dev/snd/controlC0:  ubuntu-mate   1718 F.... pulseaudio
  CasperVersion: 1.376
  CurrentDesktop: MATE
  Date: Wed May 11 00:43:52 2016
  LiveMediaBuild: Ubuntu-MATE 16.04 LTS "Xenial Xerus" - Release amd64 
   PATH=(custom, no user)
  SourcePackage: pulseaudio
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 11/04/2015
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A10
  dmi.board.vendor: Dell Inc.
  dmi.chassis.type: 9
  dmi.chassis.vendor: Dell Inc.
  dmi.product.name: Latitude 3340
  dmi.product.version: 00
  dmi.sys.vendor: Dell Inc.

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