Comment 44 for bug 1589008

The issue persists when using A2DP (as opposed to HSP/HFP), with the following setup:

BT Adapter: Bus 004 Device 014: ID 0a12:0001 Cambridge Silicon Radio, Ltd Bluetooth Dongle (HCI mode)

BT Headphones: Mixcder ShareMe Wireless Bluetooth Headphones with Mic, Shareme Fuction, Bluetooth 4.1 Stereo Headset

Ubuntu 16.04, with kernel: Linux dash-desktop 4.4.0-89-generic #112-Ubuntu x86_64

Same with my mac, also running 16.04 with the same headphone.

Switching to HSP always works for me, but the sound quality is terrible.

The following workaround works for me when using the USB dongle:

- Disconnect bluetooth device.
- Restart bluetooth daemon.
- Connect bluetooth adapter.
- Manually connect to the headphones again.
- Change sound settings, possibly selecting the BT device for audio playback, and sometimes switching to HSP and back to A2DP.