iPhone通过蓝牙作为音频源连接到Linux时，不能通过iPhone调节pulseaudio合成音量问题的解决

sudo vim /lib/systemd/system/bluetooth.service

append --plugin=a2dp to the following line

ExecStart=/usr/lib/bluetooth/bluetoothd

as follows

ExecStart=/usr/lib/bluetooth/bluetoothd --plugin=a2dp --compat

also per Baby Bluetooth Steps - Debian / Raspbian Stretch add --noplugin=sap

ExecStart=/usr/lib/bluetooth/bluetoothd --plugin=a2dp --compat --noplugin=sap

Then run the following two commands

sudo systemctl daemon-reload
sudo systemctl restart bluetooth

https://askubuntu.com/questions/997553/ubuntu-18-04-17-10-pulseaudio-bluetooth-ios-volume-control

iPhone通过蓝牙作为音频源连接到Linux时，不能通过iPhone调节pulseaudio合成音量问题的解决

原文：https://www.cnblogs.com/dylanchu/p/11048353.html