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[Raymond <1465167@xxxxxxxxxxxxxxxxxx>]

there is no easy workaround , you have to report you bug upstream

driver create the incorrect line out playback switch and connect to
speaker+lo playback volume but create headphine jack detection kctl

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https://bugs.launchpad.net/bugs/1465167

Title:
  Low volume with headphones

Status in pulseaudio package in Ubuntu:
  Incomplete

Bug description:
  I've made a clean install of Ubuntu 15.04 but I'm having this issue
  when using headphones. Volume is very low, even when turning it to
  maximum. Everything worked fine under Ubuntu 14.04 that I was using
  before 15.04.

  I've reset the audio configuration with the command "rm -r
  ~/.config/pulse; pulseaudio -k" but it only fixes the issue
  temporarily. After each restart, the issue happens again and I have to
  execute the above command to get normal volume with headphones.

  Volume is normal with built-in speakers however.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: pulseaudio 1:6.0-0ubuntu6
  ProcVersionSignature: Ubuntu 3.19.0-20.20-generic 3.19.8
  Uname: Linux 3.19.0-20-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.17.2-0ubuntu1.1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  erik       1836 F.... pulseaudio
   /dev/snd/controlC0:  erik       1836 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Mon Jun 15 09:34:28 2015
  InstallationDate: Installed on 2015-04-24 (52 days ago)
  InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
  SourcePackage: pulseaudio
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 02/29/2008
  dmi.bios.vendor: TOSHIBA
  dmi.bios.version: Version 2.20
  dmi.board.name: Portable PC
  dmi.board.vendor: TOSHIBA
  dmi.board.version: Version A0
  dmi.chassis.asset.tag: 00000000
  dmi.chassis.type: 10
  dmi.chassis.vendor: TS
  dmi.chassis.version: IBA
  dmi.modalias: dmi:bvnTOSHIBA:bvrVersion2.20:bd02/29/2008:svnTOSHIBA:pnQOSMIOG40:pvrPQG40E-01G019FR:rvnTOSHIBA:rnPortablePC:rvrVersionA0:cvnTS:ct10:cvrIBA:
  dmi.product.name: QOSMIO G40
  dmi.product.version: PQG40E-01G019FR
  dmi.sys.vendor: TOSHIBA

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