$ dmesg | grep -i blue
[   16.238849] Bluetooth: Core ver 2.17
[   16.238874] Bluetooth: HCI device and connection manager initialized
[   16.238885] Bluetooth: HCI socket layer initialized
[   16.238887] Bluetooth: L2CAP socket layer initialized
[   16.238892] Bluetooth: SCO socket layer initialized
[   16.242898] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
[   16.242902] Bluetooth: BNEP filters: protocol multicast
[   16.242910] Bluetooth: BNEP socket layer initialized
[   28.860999] Bluetooth: RFCOMM TTY layer initialized
[   28.861015] Bluetooth: RFCOMM socket layer initialized
[   28.861022] Bluetooth: RFCOMM ver 1.11