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[orlando <1363728@xxxxxxxxxxxxxxxxxx>]

If could be useful I have found a workaround for this issue. I hope it is usefull to understand better the problem.
I have an Asus n550JV with ALC668, quad array speaker and subwoofer; I have a dual boot with windows 8.1 and ubuntu14.04 LTS.
If I disable the audio card from windows (by device manager) and restart I have fully working audio on ubuntu.
I write a script which enable and disable audio on windows start and restart event.  Please tell me if are useful more alsa or details and log

Antonino

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https://bugs.launchpad.net/bugs/1363728

Title:
  [N550JK, Realtek ALC668, Speaker, Internal] No sound at all

Status in alsa-driver package in Ubuntu:
  New

Bug description:
  Yesterday I had any sound problems, but now there is not sound at all.

  
  Alsa-info is here: http://www.alsa-project.org/db/?f=20a70e0b479a3318f508f345060f2bed5a2789b4

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: alsa-base 1.0.25+dfsg-0ubuntu4
  ProcVersionSignature: Ubuntu 3.13.0-34.60-generic 3.13.11.4
  Uname: Linux 3.13.0-34-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.3
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  fatih      2066 F.... pulseaudio
   /dev/snd/controlC1:  fatih      2066 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Sun Aug 31 23:32:51 2014
  InstallationDate: Installed on 2014-08-05 (25 days ago)
  InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
  PackageArchitecture: all
  SourcePackage: alsa-driver
  Symptom: audio
  Symptom_AlsaPlaybackTest: ALSA playback test through plughw:PCH failed
  Symptom_Card: Built-in Audio - HDA Intel PCH
  Symptom_DevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  fatih      2066 F.... pulseaudio
   /dev/snd/controlC1:  fatih      2066 F.... pulseaudio
  Symptom_Jack: Speaker, Internal
  Symptom_Type: No sound at all
  Title: [N550JK, Realtek ALC668, Speaker, Internal] No sound at all
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 01/23/2014
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: N550JK.204
  dmi.board.asset.tag: ATN12345678901234567
  dmi.board.name: N550JK
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: 1.0
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: ASUSTeK COMPUTER INC.
  dmi.chassis.version: 1.0
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrN550JK.204:bd01/23/2014:svnASUSTeKCOMPUTERINC.:pnN550JK:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnN550JK:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0:
  dmi.product.name: N550JK
  dmi.product.version: 1.0
  dmi.sys.vendor: ASUSTeK COMPUTER INC.

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