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[Martin Vysny <vysny@xxxxxxx>]

Thank you very much for your reply. I can't say that I really understand all that stuff ;)
I tried to disable 0x1a first, but then the line out stopped working entirely. I have therefore enabled 0x1a and disabled 0x15, things are working so far. Please see screenshot for details.

** Attachment added: "Screenshot from 2015-11-20 18-35-47.png"
   https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1518310/+attachment/4522704/+files/Screenshot%20from%202015-11-20%2018-35-47.png

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https://bugs.launchpad.net/bugs/1518310

Title:
  [Dell L521X, ALC3260]No sound through headphones after boot

Status in alsa-driver package in Ubuntu:
  Incomplete

Bug description:
  After Ubuntu boots, randomly (say with 25% probability) the Headphone
  alsamixer setting will be muted and set to 0 on my notebook. The
  notebook will not play any sounds on headphones, only through the
  notebook speakers when headphones are disconnected. I then have to
  manually run alsamixer, unmute the Headphone setting and max it out to
  100. This started to happen after upgrade to Ubuntu 15.10 - Ubuntu
  15.04 worked fine.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: alsa-base 1.0.25+dfsg-0ubuntu5
  ProcVersionSignature: Ubuntu 4.2.0-18.22-generic 4.2.3
  Uname: Linux 4.2.0-18-generic x86_64
  ApportVersion: 2.19.1-0ubuntu5
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  vyzivus    2444 F.... pulseaudio
   /dev/snd/pcmC0D0p:   vyzivus    2444 F...m pulseaudio
   /dev/snd/controlC0:  vyzivus    2444 F.... pulseaudio
                        vyzivus    6270 F.... alsamixer
  CurrentDesktop: Unity
  Date: Fri Nov 20 13:45:18 2015
  InstallationDate: Installed on 2014-03-07 (622 days ago)
  InstallationMedia: Ubuntu-Server 13.04 "Raring Ringtail" - Release amd64 (20130423.1)
  PackageArchitecture: all
  SourcePackage: alsa-driver
  UpgradeStatus: Upgraded to wily on 2015-10-08 (43 days ago)
  dmi.bios.date: 12/17/2013
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A16
  dmi.board.name: 029M77
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: A16
  dmi.modalias: dmi:bvnDellInc.:bvrA16:bd12/17/2013:svnDellInc.:pnXPSL521X:pvrA16:rvnDellInc.:rn029M77:rvrA00:cvnDellInc.:ct8:cvrA16:
  dmi.product.name: XPS L521X
  dmi.product.version: A16
  dmi.sys.vendor: Dell Inc.

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