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Sennheiser MM450-X Bluetooth headset gets recognized out of the box in Ubuntu 12.04 beta 64-bit. I used this workaround to get past the reconnection problem: Issues with Bluetooth Connections in 11.10

Although the device is successfully connected I am not able to hear any sound into the headphones. Some interference noise is produced instead.

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What sound profile did you set up your Bluetooth device? – Takkat Apr 7 '12 at 12:48
I don't know what you mean with "sound profile". Anyway I didn't set up anything, I left the default settings. – Krige Apr 8 '12 at 9:56
up vote 2 down vote accepted

I have solved it by following the steps below:

  • open the Sound Settings;
  • select the device in the "Play sound through" pane;
  • select "High Fidelity Playback (A2DP)" in the "Mode" combo box;
  • make sure the "Mute" checkbox is unchecked.

enter image description here

share|improve this answer
Sound profile is the same as your "Mode" box. – Takkat Apr 8 '12 at 18:58

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