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[prawns <1403938@xxxxxxxxxxxxxxxxxx>]

I've got the same problem:
1. sound is distorted
2. this is because in the default Ubuntu (14.04) mixer on the tab "Applications", the application "CubebUtils" that has Firefox icon the sound level slider is set to max value
3. When I decrease the sound value for that particular application, sound becomes not-destorted even if I increase the overall volume way beyond 100% ("Allow louder than 100%" is ticked)
4. Such destortion can be achieved for any app playing sound by manually setting that individual app's volume slider to the right. However:
5. All other apps do remember value that I set. Firefox (CubebUtils) does not. This means every time I play a new track or even jump to another position within the same track, the sound volume of CubebUtils automatically jumps to max.
6. I've noticed that YouTube appears on the "Applications" tab as "Alsa plugin", whereas for example "Sound cloud" or "Free Music Archive" appear as "CubebUtils".

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https://bugs.launchpad.net/bugs/1403938

Title:
  Sound problem with firefox

Status in firefox package in Ubuntu:
  Confirmed

Bug description:
  I'm using Ubuntu on more than half a dozen machines. Only on one of
  these machines I had the problem, that I did not hear sound when
  playing videos with firefox, although the sound on that machine works
  (e.g. when watchting the same videos with mplayer from command line.)

  Which caused me a lot of headache and debugging time.

  I'fe finally found the problem. I need to use pavucontrol or pacmd ,
  then identify the input stream from firefox (a firefox logo and named
  as CubebUtils , and set the volume from 0 to 100% or do something like

  pacmd set-sink-input-volume 1 65535

  where 1 is the input number determined with e.g. pacmd list

  
  So it seems as if the sound driver of firefox lacks a proper volume setting, which might not cause any problems with most sound cards, however, my sound card (or it's driver) has a volume of 0. 

  % lspci | fgrep Audio
  00:1b.0 Audio device: Intel Corporation 6 Series/C200 Series Chipset Family High Definition Audio Controller (rev 05)

  
  regards

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: firefox 34.0+build2-0ubuntu0.14.04.1
  ProcVersionSignature: Ubuntu 3.13.0-43.72-generic 3.13.11.11
  Uname: Linux 3.13.0-43-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl zcommon znvpair
  AddonCompatCheckDisabled: False
  ApportVersion: 2.14.1-0ubuntu3.5
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  hadmut     3307 F.... panel-12-mixer
                        hadmut     3316 F.... pulseaudio
   /dev/snd/pcmC0D0p:   hadmut     3316 F...m pulseaudio
  BuildID: 20141127111021
  CRDA: Error: [Errno 2] Datei oder Verzeichnis nicht gefunden: 'iw'
  Channel: Unavailable
  CurrentDesktop: XFCE
  Date: Thu Dec 18 16:54:17 2014
  Extensions: extensions.sqlite corrupt or missing
  ForcedLayersAccel: False
  IncompatibleExtensions: Unavailable (corrupt or non-existant compatibility.ini or extensions.sqlite)
  InstallationDate: Installed on 2014-08-06 (133 days ago)
  InstallationMedia: Ubuntu-Server 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.3)
  IpRoute:
   default via 192.168.164.1 dev p5p1 
   169.254.0.0/16 dev p5p1  scope link  metric 1000 
   192.168.164.0/24 dev p5p1  proto kernel  scope link  src 192.168.164.100 
   192.168.200.0/24 dev vlan0  proto kernel  scope link  src 192.168.200.1
  Locales: extensions.sqlite corrupt or missing
  Plugins:
   Windows Media Player Plug-in - /usr/lib/mozilla/plugins/gecko-mediaplayer-wmp.so (gecko-mediaplayer)
   RealPlayer 9 - /usr/lib/mozilla/plugins/gecko-mediaplayer-rm.so (gecko-mediaplayer)
   QuickTime Plug-in 7.6.9 - /usr/lib/mozilla/plugins/gecko-mediaplayer-qt.so (gecko-mediaplayer)
   DivX Browser Plug-In - /usr/lib/mozilla/plugins/gecko-mediaplayer-dvx.so (gecko-mediaplayer)
   mplayerplug-in is now gecko-mediaplayer 1.0.8 - /usr/lib/mozilla/plugins/gecko-mediaplayer.so (gecko-mediaplayer)
  PrefSources: prefs.js
  Profiles: Profile0 (Default) - LastVersion=34.0/20141127111021 (In use)
  RelatedPackageVersions: gecko-mediaplayer 1.0.8-4ubuntu1
  RfKill:
   0: phy0: Wireless LAN
   	Soft blocked: no
   	Hard blocked: no
  RunningIncompatibleAddons: False
  SourcePackage: firefox
  Themes: extensions.sqlite corrupt or missing
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 10/12/2012
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: H61TIW08.111
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: H61H2-TI2
  dmi.board.vendor: Medion
  dmi.board.version: 1.0
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: Medion
  dmi.chassis.version: 1.0
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrH61TIW08.111:bd10/12/2012:svnMedion:pnG24:pvr1.0:rvnMedion:rnH61H2-TI2:rvr1.0:cvnMedion:ct3:cvr1.0:
  dmi.product.name: G24
  dmi.product.version: 1.0
  dmi.sys.vendor: Medion

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