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[TinBay <joybeefly@xxxxxxx>]

I already reported this to the kernel bugzillna

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https://bugs.launchpad.net/bugs/1357724

Title:
  Extremely low volume from HP, also skipping and distorted voice

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

Bug description:
  I plugged into my headphone into rear red jack and I got extremely low
  volume despite I set max volume with slider, so is front Headphone
  jack. I dumpped the sound codec and found they are all EAPD node. I
  also get some skipping and distorted issue.

  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
  CurrentDesktop: XFCE
  Date: Sat Aug 16 21:57:33 2014
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2014-08-15 (1 days ago)
  InstallationMedia: Xubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140723)
  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: Red Line Out, Rear
  Symptom_PulsePlaybackTest: PulseAudio playback test successful
  Symptom_Type: Underruns, dropouts, or "crackling" sound
  Title: [MS-7918, Realtek ALC1150, Red Line Out, Rear] Underruns, dropouts or crackling sound
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 07/24/2014
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: V2.3
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: Z97 GAMING 3 (MS-7918)
  dmi.board.vendor: MSI
  dmi.board.version: 1.0
  dmi.chassis.asset.tag: To be filled by O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: MSI
  dmi.chassis.version: 1.0
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrV2.3:bd07/24/2014:svnMSI:pnMS-7918:pvr1.0:rvnMSI:rnZ97GAMING3(MS-7918):rvr1.0:cvnMSI:ct3:cvr1.0:
  dmi.product.name: MS-7918
  dmi.product.version: 1.0
  dmi.sys.vendor: MSI

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