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I recently installed Ubuntu 12.10,and I can see it in the list of inputs. But when I select it then no sound I have tried restarting pulse audio demon and I have tried purging .pulse and .pulse-cookie directory as well. As I said it is visible in list but after selection no sound I have tried changing the 5.1 and 4.1 as well.

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The solution was to unmute a volume control in alsamixer. In simple steps:

  1. Open a terminal
  2. Type alsamixer, hit Enter

    A sort of GUI will be presented.

  3. Press F6 and select 'Bose'.

  4. Increase the volume on the PCM channel using the arrow keys.

    I am not sure it is the right volume control, since there was no master and all.

More details are here: Howto- Resolve Nosound Problem On Ubuntu 12.10, 12.04 And Older

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This is not specific for any Bose product - any sound card can have this error, so your solution is universal. – gertvdijk Dec 23 '12 at 17:56
thanks gertvdjik – Mohit Dec 24 '12 at 16:05

The problem was not with Ubuntu/PulseAudio. Instead the problem was with the Bose Companion 5 System.

I turned off the Companion 5 system for 20 seconds, using the switch at the back of the subwoofer, then I switched it back on, and voilá! No need to reboot Ubuntu, the 'Bose' output device disappeared and re-appeared during the process, and now the sound is going out fine.

I usually leave the Bose system on 24x7, plugged into a power surge protected line, but for some reason, it seems like it crashed. A reboot of the Companion 5 was the solution.

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