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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, 2012 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. Apr 8, 2012 at 9:56

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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

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    Sound profile is the same as your "Mode" box.
    – Takkat
    Apr 8, 2012 at 18:58

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