dmesg | grep tooth
[ 15.900574] Bluetooth: Core ver 2.20
[ 15.900601] Bluetooth: HCI device and connection manager initialized
[ 15.900606] Bluetooth: HCI socket layer initialized
[ 15.900609] Bluetooth: L2CAP socket layer initialized
[ 15.900618] Bluetooth: SCO socket layer initialized
[ 16.679895] Bluetooth: hci0 hardware error 0x37
[ 26.275408] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
[ 26.275412] Bluetooth: BNEP filters: protocol multicast
[ 26.275417] Bluetooth: BNEP socket layer initialized
[ 60.067208] Bluetooth: RFCOMM TTY layer initialized
[ 60.067221] Bluetooth: RFCOMM socket layer initialized
[ 60.067227] Bluetooth: RFCOMM ver 1.11
it appears every time when I turn on my notebook . I am use debian interface with kde