修复蓝牙设备(特别是音频设备)断链
https://www.linuxquestions.org/questions/linux-hardware-18/problem-with-any-bluetooth-device-4175631846
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=355497
conf
# Defaults for bluez
# start bluetooth on boot?
# compatibility note: If this variable is not found bluetooth will
# start
BLUETOOTH_ENABLED=1
# This setting will switch HID devices (e.g mouse/keyboad) to HCI mode, that is
# you will have bluetooth functionality from your dongle instead of only HID.
# Note that not every bluetooth dongle is capable of switching back to HID
# mode, see http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=355497
HID2HCI_ENABLED=1
HID2HCI_UNDO=1