> you have to remove
> options snd-hda-Intel model=generic
> from /etc/modprobe.d/alsa-base.conf

I added this line because I read somewhere, that this would fix the
already existing problem.

It didn't help though, and removing it again solves the problem with the
NB speakers, BUT NOT with the sound volume fluctuation ...

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https://bugs.launchpad.net/bugs/1210976

Title:
  sound volume fluctuates, NB speaker always on ... [12.04 LTS]

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

Bug description:
  Since the update to 3.2.0-51-generic I have a very annoying problem
  with audio playback:

  1.) Volume jumps up and down randomly (even when all levels are 100% in 
alsamixer)
  2.) Even when external speakers  are plugged in the audio jack, the NB 
speakers are active

  uname -a
  Linux blackbox 3.2.0-51-generic #77-Ubuntu SMP Wed Jul 24 20:18:19 UTC 2013 
x86_64 x86_64 x86_64 GNU/Linux

  lsb_release -rd
  Description:  Ubuntu 12.04.2 LTS
  Release:      12.04

  Please let me know, what I can provide to help.
  --- 
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
  AplayDevices:
   **** List of PLAYBACK Hardware Devices ****
   card 0: PCH [HDA Intel PCH], device 0: HDA Generic [HDA Generic]
     Subdevices: 0/1
     Subdevice #0: subdevice #0
  ApportVersion: 2.0.1-0ubuntu17.4
  Architecture: amd64
  ArecordDevices:
   **** List of CAPTURE Hardware Devices ****
   card 0: PCH [HDA Intel PCH], device 0: HDA Generic [HDA Generic]
     Subdevices: 1/1
     Subdevice #0: subdevice #0
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  dc         4852 F.... pulseaudio
   /dev/snd/pcmC0D0p:   dc         4852 F...m pulseaudio
  Card0.Amixer.info:
   Card hw:0 'PCH'/'HDA Intel PCH at 0xc4400000 irq 44'
     Mixer name : 'Intel ID 2805'
     Components : 'HDA:10ec0269,10250623,00100100 
HDA:80862805,10250623,00100000'
     Controls      : 5
     Simple ctrls  : 4
  DistroRelease: Ubuntu 12.04
  InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
  MarkForUpload: True
  Package: alsa-base 1.0.25+dfsg-0ubuntu1.1
  PackageArchitecture: all
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcVersionSignature: Ubuntu 3.2.0-51.77-generic 3.2.48
  Tags:  precise running-unity
  Uname: Linux 3.2.0-51-generic x86_64
  UpgradeStatus: Upgraded to precise on 2012-04-26 (471 days ago)
  UserGroups: adm admin cdrom dialout lp lpadmin plugdev sambashare
  dmi.bios.date: 09/29/2011
  dmi.bios.vendor: INSYDE
  dmi.bios.version: V1.06
  dmi.board.asset.tag: Base Board Asset Tag
  dmi.board.name: HMA51_HR
  dmi.board.vendor: Acer
  dmi.board.version: Base Board Version
  dmi.chassis.type: 10
  dmi.chassis.vendor: Chassis Manufacturer
  dmi.chassis.version: Chassis Version
  dmi.modalias: 
dmi:bvnINSYDE:bvrV1.06:bd09/29/2011:svnAcer:pnAspire5749:pvrV1.06:rvnAcer:rnHMA51_HR:rvrBaseBoardVersion:cvnChassisManufacturer:ct10:cvrChassisVersion:
  dmi.product.name: Aspire 5749
  dmi.product.version: V1.06
  dmi.sys.vendor: Acer
  modified.conffile..etc.modprobe.d.alsa.base.conf: [modified]
  mtime.conffile..etc.modprobe.d.alsa.base.conf: 2013-08-11T04:28:45.740402
  --- 
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
  AplayDevices:
   **** List of PLAYBACK Hardware Devices ****
   card 0: PCH [HDA Intel PCH], device 0: HDA Generic [HDA Generic]
     Subdevices: 0/1
     Subdevice #0: subdevice #0
  ApportVersion: 2.0.1-0ubuntu17.4
  Architecture: amd64
  ArecordDevices:
   **** List of CAPTURE Hardware Devices ****
   card 0: PCH [HDA Intel PCH], device 0: HDA Generic [HDA Generic]
     Subdevices: 1/1
     Subdevice #0: subdevice #0
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  dc         4852 F.... pulseaudio
   /dev/snd/pcmC0D0p:   dc         4852 F...m pulseaudio
  Card0.Amixer.info:
   Card hw:0 'PCH'/'HDA Intel PCH at 0xc4400000 irq 44'
     Mixer name : 'Intel ID 2805'
     Components : 'HDA:10ec0269,10250623,00100100 
HDA:80862805,10250623,00100000'
     Controls      : 5
     Simple ctrls  : 4
  DistroRelease: Ubuntu 12.04
  InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
  MarkForUpload: True
  Package: alsa-base 1.0.25+dfsg-0ubuntu1.1
  PackageArchitecture: all
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcVersionSignature: Ubuntu 3.2.0-51.77-generic 3.2.48
  Tags:  precise running-unity
  Uname: Linux 3.2.0-51-generic x86_64
  UpgradeStatus: Upgraded to precise on 2012-04-26 (471 days ago)
  UserGroups: adm admin cdrom dialout lp lpadmin plugdev sambashare
  dmi.bios.date: 09/29/2011
  dmi.bios.vendor: INSYDE
  dmi.bios.version: V1.06
  dmi.board.asset.tag: Base Board Asset Tag
  dmi.board.name: HMA51_HR
  dmi.board.vendor: Acer
  dmi.board.version: Base Board Version
  dmi.chassis.type: 10
  dmi.chassis.vendor: Chassis Manufacturer
  dmi.chassis.version: Chassis Version
  dmi.modalias: 
dmi:bvnINSYDE:bvrV1.06:bd09/29/2011:svnAcer:pnAspire5749:pvrV1.06:rvnAcer:rnHMA51_HR:rvrBaseBoardVersion:cvnChassisManufacturer:ct10:cvrChassisVersion:
  dmi.product.name: Aspire 5749
  dmi.product.version: V1.06
  dmi.sys.vendor: Acer
  modified.conffile..etc.modprobe.d.alsa.base.conf: [modified]
  mtime.conffile..etc.modprobe.d.alsa.base.conf: 2013-08-11T04:28:45.740402

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