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[Raymond <1462229@xxxxxxxxxxxxxxxxxx>]

https://bugzilla.kernel.org/enter_bug.cgi?product=Drivers

sound/alsa

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https://bugs.launchpad.net/bugs/1462229

Title:
  Sound is muted when plugging in a headphone although volume is up

Status in alsa-driver package in Ubuntu:
  New

Bug description:
  Description:	Ubuntu 15.04
  Release:	15.04

  When a headphone is plugged in, sound is muted altough the headphone volume is still up. 
  When I open alsamixer I can regain sound on my headphone by unmuting the speaker channel and increasing the volume on the volume channel. However each time that I unplug my headphone I need to redo this.
  So it looks like, in contradiction to how the software is programmed and users understand, the headphone and speaker channels work in serial for headphone output instead of parallel.
  Because this used to work for years (at least since Ubuntu 12.04, I used them all), this bug is introduced in the lastest release (15.04). 
  I also filed this bug in the alsamixer package, but afterwards I realised that I probably have filed it at the wrong spot. 

  Kind regards,
  Bart

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: alsa-base 1.0.25+dfsg-0ubuntu4
  ProcVersionSignature: Ubuntu 3.19.0-18.18-generic 3.19.6
  Uname: Linux 3.19.0-18-generic x86_64
  ApportVersion: 2.17.2-0ubuntu1.1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/pcmC0D0c:   bdekoning   1717 F...m pulseaudio
   /dev/snd/pcmC0D0p:   bdekoning   1717 F...m pulseaudio
   /dev/snd/controlC0:  bdekoning   1717 F.... pulseaudio
                        bdekoning   2184 F.... alsamixer
  CurrentDesktop: Unity
  Date: Fri Jun  5 08:58:16 2015
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2015-05-12 (23 days ago)
  InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
  PackageArchitecture: all
  SourcePackage: alsa-driver
  Symptom: audio
  Symptom_Card: Intern geluid - HDA Intel MID
  Symptom_Jack: Black Headphone Out, Left
  Symptom_Type: Volume slider, or mixer problems
  Title: [HP ProBook 6550b, IDT 92HD75B3X5, Black Headphone Out, Left] volume slider problem
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 10/27/2010
  dmi.bios.vendor: Hewlett-Packard
  dmi.bios.version: 68CDF Ver. F.04
  dmi.board.name: 146E
  dmi.board.vendor: Hewlett-Packard
  dmi.board.version: KBC Version 73.12
  dmi.chassis.asset.tag: CNU0483Z5Q
  dmi.chassis.type: 10
  dmi.chassis.vendor: Hewlett-Packard
  dmi.modalias: dmi:bvnHewlett-Packard:bvr68CDFVer.F.04:bd10/27/2010:svnHewlett-Packard:pnHPProBook6550b:pvr:rvnHewlett-Packard:rn146E:rvrKBCVersion73.12:cvnHewlett-Packard:ct10:cvr:
  dmi.product.name: HP ProBook 6550b
  dmi.sys.vendor: Hewlett-Packard

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