Wait a minute, this might not be a bug at all...

A2DP is uni-directional so doesn't support simultaneous audio output and input. 
In theory A2DP can be used for output or input, depending on what your 
peripherals support...
  
https://en.wikipedia.org/wiki/List_of_Bluetooth_profiles#Advanced_Audio_Distribution_Profile_.28A2DP.29

Generally speaking though, there is no microphone when a headset is in A2DP 
mode:
  http://www.tomsguide.com/answers/id-3286122/headset-mic-work-audio.html

The PulseAudio "fix" for the previous bug involves automatically
switching to the lower quality HSP/HFP profile when the microphone is
required. This is triggered automatically according to what features the
application requests. However automatic switching is apparently only
implemented for VoIP applications according to the release notes:

  https://www.freedesktop.org/wiki/Software/PulseAudio/Notes/10.0/

So automatic switching relies on the application supporting PulseAudio's
"property media.role=phone". If it doesn't yet then that's an
application bug. But beware that once switching has occurred and the mic
turns on, your audio output is likely to also be low quality (HSP/HFP
profile). This is just a fact of life with Bluetooth standards.

This bug is therefore invalid for pulseaudio, but your app(s) might be
able to add the above feature to trigger the automatic switching. If
you're having trouble with a specific app then please click on one of
the "Also affects..." links at the top of the bug.

** Changed in: pulseaudio (Ubuntu)
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/1711087

Title:
  ad2p sink profile mic not available

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