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[Karl Grzeszczak <karl@xxxxxxxxxxx>]

Update to this, which might help in diagnosing, might not.

I can ensure that the bluetooth A2DP connection will successfully
deliver audio to my headset consistently if I switch back to "Headset
Head Unit (HSP/HFP)" mode in Sound settings prior to disconnecting the
headset.

Then, next time I connect the headset, it will be in "Headset Head Unit
(HSP/HFP)" mode, but when I switch to "High Fidelity Playback (A2DP
Sink)" every single time it successfully plays back audio.

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https://bugs.launchpad.net/bugs/1438510

Title:
  [REGRESSION] bluetooth headset no longer supports a2dp

Status in bluez package in Ubuntu:
  Confirmed
Status in pulseaudio package in Ubuntu:
  Confirmed
Status in bluez source package in Vivid:
  Confirmed
Status in pulseaudio source package in Vivid:
  Confirmed

Bug description:
  Just installed 15.04 fresh from the latest ISO (beta2).

  I'm bummed to see my bluetooth headset (Bose Soundlink overear) seems
  to have regressed in functionality.

  In 14.10, I was able to set the output profile either to a2dp or
  hsp/hfp (telephony duplex).

  In 15.04, it only works in telephony duplex mode.  I can't get high
  fidelity sound playback to work at all.

  This thread seems to be related, though the workaround within did not solve the problem for me:
  https://bbs.archlinux.org/viewtopic.php?id=194006

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