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[lucianj <lucianjelea@xxxxxxxxx>]

Worked for me as well.. the solution described by Fernando. Thanks.

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https://bugs.launchpad.net/bugs/1398971

Title:
  [SATELLITE P50t-B-112, Realtek ALC284, Speaker, Internal] No sound at
  all

Status in alsa-driver package in Ubuntu:
  New

Bug description:
  My sound card is not working under Ubuntu 14.10

  ProblemType: Bug
  DistroRelease: Ubuntu 14.10
  Package: alsa-base 1.0.25+dfsg-0ubuntu4
  ProcVersionSignature: Ubuntu 3.16.0-25.33-generic 3.16.7
  Uname: Linux 3.16.0-25-generic x86_64
  ApportVersion: 2.14.7-0ubuntu8
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  maria      2473 F.... pulseaudio
   /dev/snd/controlC1:  maria      2473 F.... pulseaudio
                        maria     12484 F.... alsamixer
  CurrentDesktop: Unity
  Date: Wed Dec  3 21:26:29 2014
  InstallationDate: Installed on 2014-11-29 (4 days ago)
  InstallationMedia: Ubuntu 14.10 "Utopic Unicorn" - Release amd64 (20141022.1)
  PackageArchitecture: all
  SourcePackage: alsa-driver
  Symptom: audio
  Symptom_AlsaPlaybackTest: ALSA playback test through plughw:PCH failed
  Symptom_Card: Audio Interno - HDA Intel PCH
  Symptom_DevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  maria      2473 F.... pulseaudio
   /dev/snd/controlC1:  maria      2473 F.... pulseaudio
                        maria     12484 F.... alsamixer
  Symptom_Jack: Speaker, Internal
  Symptom_Type: No sound at all
  Title: [SATELLITE P50t-B-112, Realtek ALC284, Speaker, Internal] No sound at all
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 04/03/2014
  dmi.bios.vendor: TOSHIBA
  dmi.bios.version: 1.10
  dmi.board.asset.tag: ATN12345678901234567
  dmi.board.name: VG20SQ
  dmi.board.vendor: TOSHIBA
  dmi.board.version: To be filled by O.E.M.
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: TOSHIBA
  dmi.chassis.version: To Be Filled By O.E.M.
  dmi.modalias: dmi:bvnTOSHIBA:bvr1.10:bd04/03/2014:svnTOSHIBA:pnSATELLITEP50t-B-112:pvrPSPNVE-01G00FCE:rvnTOSHIBA:rnVG20SQ:rvrTobefilledbyO.E.M.:cvnTOSHIBA:ct10:cvrToBeFilledByO.E.M.:
  dmi.product.name: SATELLITE P50t-B-112
  dmi.product.version: PSPNVE-01G00FCE
  dmi.sys.vendor: TOSHIBA

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