For those approaching the issue from afresh it looks like HSP/HFP shares functionality with bluetooth modems rather than solely audio. As such there's a disagreement between pulseaudio who are only interested in the audio parts, ofono who deals with the modem parts and the bluetooth stack (bluez) who connect the to the hardware.
The issue came about as support was dropped (assuming someone else would pick it up) as pulse audio and bluez went to later versions. It hasn't been resolved because no one wants to ether deal with the other part, or have another abstraction layer to switch between modem and audio functionality -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to pulseaudio in Ubuntu. https://bugs.launchpad.net/bugs/1576559 Title: Refused to switch profile to headset_head_unit: Not connected Status in PulseAudio: Unknown Status in pulseaudio package in Ubuntu: Confirmed Bug description: I'm trying to connect a bluetooth-speaker-with-microphone (Mi Bluetooth Speaker) to Ubuntu. It works well as an A2DP sync, but can't use it as a headset with microphone. The device doesn't list in the "Input Devices" by default, and using the sound settings to change the profile of the device to HSP/HFP results in this log message: W: [pulseaudio] module-bluez5-device.c: Refused to switch profile to headset_head_unit: Not connected I'm running Ubuntu 16.04 LTS. I did an upgrade from Ubuntu 15.10. pulseaudio: Installed: 1:8.0-0ubuntu3 bluez: Installed: 5.37-0ubuntu5 To manage notifications about this bug go to: https://bugs.launchpad.net/pulseaudio/+bug/1576559/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
