make A2DP (better audio) default for bluetooth headphones

[ruebenramirez]

• bluetooth headphones with microphones will auto connect via bluetooth as headsets.
• microphones in bluetooth connections can require up to half of your bluetooth connection bandwidth
• A2DP is an audio profile for high fidelity audio that we can enable by default by disabling bluetooth headset mode

How to do this:

• disable headset mode in bluetooth audio configuration
• restart the bluetooth service

my /etc/bluetooth/audio.conf file was empty on my machine, so I was able to just:

echo "[General]\nDisable=Headset" | sudo tee -a /etc/bluetooth/audio.conf
sudo systemctl restart bluetooth

source: https://jimshaver.net/2015/03/31/going-a2dp-only-on-linux/