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@karlgrz

I saw the issues you were having and had recently just figured out the
same work-around. Just as I was going to post it for you, I see that you
too have narrowed it down to this repeatable behavior.

For me however, I do not switch back to HSP, rather I turn the profile OFF in pavucontrol "configuration" tab. Then I disconnect the bluetooth using the its graphic interface.
The next time I connect the bluetooth device, it connects just fine. Then I simply go to the config tab in pavucontrol to switch the device to A2DP sink.  It works every time this way.

In the past, switching the profile to OFF in pavucontrol prior to disconnecting the bluetooth device was unnecessary.
I am currently running Kubuntu 16.04 LTS, but have had 16.04 installed since beta. This regression was not present for me in any previous versions.

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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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