The Thinkpad X220 has an internal Bluetooth controller, but I installed the AC7260 wifi/bluetooth card.
Unfortunately the default card remains the internal one, so autoconnect of my headset doesn't work.
In order to block the internal device, I made a UDEV rule in /etc/udev/rules.d/91-bluetooth-hci.rules
After obtaining the id with lsusb:
SUBSYSTEM=="usb", ATTRS{idVendor}=="8087", ATTRS{idProduct}=="07dc", ATTR{authorized}="0"
Reboot, and the AC7260 Bluetooth card is now the default.
ยง