** Description changed:

  Binary package hint: alsa-base
  
  Sound works fine from the speakers, but when headphones are plugged in,
  sound gradually diminishes until it is silent. Unplugging the headphones
  leaves it silent on the speakers.  Reboot resets the position and sound
  is fine until 'phones plugged in.
  
  My card is a "Sigmatel STAC9227" in a Dell Dimension e520 desktop but it
  seems to affect similar cards.
  
  More info of the problem:
  http://ubuntuforums.org/showthread.php?t=913328&page=3
  
  To address this, you can restart alsa and pulseaudio:
  
   sudo alsa force-reload
   pulseaudio
  
- Presumably, this can be fixed by adding an option to /etc/modprobe.d
- /alsa-base but I haven't tested it yet:
- 
-  options snd-hda-intel model=dell-3stack
+ Workaround :
+ alt-f2
+ gksudo gedit /etc/modprobe.d/alsa-base.conf
+ add  "options snd-hda-intel model=3stack" to end of file (without quotes), 
save
+ reboot

-- 
alsa sound fades out when headphones are plugged in until you inaudible
https://bugs.launchpad.net/bugs/279478
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