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[Raymond <1351916@xxxxxxxxxxxxxxxxxx>]

you need to ask the realtek engineer who add support of alc271


https://git.kernel.org/cgit/linux/kernel/git/tiwai/sound.git/commit/sound/pci/hda?id=fe3eb0a73ca052ee9346a1544f4c00e697cc9a4e

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https://bugs.launchpad.net/bugs/1351916

Title:
  [Aspire V5-571G, Realtek ALC271X] 4-pin jack mic doesn't work

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

Bug description:
  I have an Acer Aspire V5-571G with a Realtek soundcard in which there is one 4-pin jack (for mic and headset). When i plug a 4-pin headset only output is detected while input remains the same (it still using the integrated computer mic).
  Right now im using Ubuntu 14.04.1 LTS but anyway it neither work in previous versions.
  EDIT: My soundcard is Realtek but in ubuntu is called HDA Intel PCH.
  --- 
  ApportVersion: 2.14.1-0ubuntu3.2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  nicolas    3548 F.... pulseaudio
   /dev/snd/pcmC0D0p:   nicolas    3548 F...m pulseaudio
  CurrentDesktop: Unity
  DistroRelease: Ubuntu 14.04
  InstallationDate: Installed on 2014-07-16 (17 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  Package: alsa-driver (not installed)
  ProcVersionSignature: Ubuntu 3.13.0-32.57-generic 3.13.11.4
  Tags:  trusty
  Uname: Linux 3.13.0-32-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm bumblebee cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 06/21/2013
  dmi.bios.vendor: Phoenix Technologies Ltd.
  dmi.bios.version: V2.18
  dmi.board.asset.tag: No Asset Tag
  dmi.board.name: Aspire V5-571G
  dmi.board.vendor: Acer
  dmi.board.version: V2.18
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 9
  dmi.chassis.vendor: Acer
  dmi.chassis.version: V2.18
  dmi.modalias: dmi:bvnPhoenixTechnologiesLtd.:bvrV2.18:bd06/21/2013:svnAcer:pnAspireV5-571G:pvrV2.18:rvnAcer:rnAspireV5-571G:rvrV2.18:cvnAcer:ct9:cvrV2.18:
  dmi.product.name: Aspire V5-571G
  dmi.product.version: V2.18
  dmi.sys.vendor: Acer

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