This bug is affecting me as well on Ubuntu 12.04 (64 bit). I connect to
a Logitech Wireless Speaker Adapter (http://www.logitech.com/en-
roeu/product/wireless-speaker-adapter?crid=47) via bluetooth so to
stream my audio to the speaker connected to the Logitech device. The
audio switches over to the bluetooth connected speakers just fine, but
the 'Output' in 'Sound Settings' doesn't as it still selects the
standard 'Speakers' of my laptop instead of the '(8D) Logitech Adapter'.
The results is that the volume controls on my keyboard still affect the
internal laptop speakers (accompanied with the Ubuntu 'increase/decrease
volume' *plop* sounds coming out of my laptop speakers) instead of the
audio coming out of my bluetooth connected speakers. Every time I
connect the bluetooth speakers I have to go to 'Sound Settings' and
select '(8D) Logitech Adapter' as output so the volume controls affect
it (the situation just after connecting to the bluetooth device is shown
in the attached screenshot). As suggested by the other people in this
bug, the Output in Sound Settings should automatically switch over to
the newly connected bluetooth audio device.

I attached two logs as requisted by Luke Yelavich. The first log depicts
connecting the bluetooth device. In the second log the bluetooth
connection is already made and I'm pressing the 'decrease volume' keys
several times followed by a series of 'increase volume'. These volume
change thus don't affect the bluetooth connected speaker.

** Attachment added: "bluetooth.png"
   
https://bugs.launchpad.net/ubuntu/+source/pulseaudio/+bug/1008539/+attachment/3648279/+files/bluetooth.png

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https://bugs.launchpad.net/bugs/1008539

Title:
  Wrong volume binding when connecting bluetooth speakers

Status in “pulseaudio” package in Ubuntu:
  Confirmed

Bug description:
  I have a 2.1 speaker system and a Logitech bluetooth adapter for them that 
connects to my Asus UL50AG notebook for sound.
  In Sound Settings, I then have 2 entries: Built-in Audio Card and Logitech 
Adapter.

  The problem is that when I connect/reconnect to the bluetooth adapter,
  the sound volume knob is not bound to the Logitech Adapter. Instead,
  in Sound Settings, the Built-in Audio Card is selected instead of the
  Logitech Adapter. And when I use the multimedia keys on my notebook
  (Volume Up, Down, Mute), they have effect on the sound coming out of
  the notebook, not the external speakers.

  The expected result would be that, when I connect/reconnect the
  bluetooth adapter, the volume multimedia keys should bound to the new
  bluetooth setup, not the internal audio.

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