Hello,
 
My bluetooth usb-stick worked fine with kernel up to 3.19. With 4.x
there is no hci device found.

lsusb
Bus 004 Device 002: ID 0a12:0001 Cambridge Silicon Radio, Ltd Bluetooth
Dongle (HCI mode)

hcitool dev
Devices:

sudo hciconfig
hci0: Type: BR/EDR Bus: USB
BD Address: 00:15:83:15:A3:0B ACL MTU: 672:4 SCO MTU: 48:1
DOWN
RX bytes:890 acl:0 sco:0 events:30 errors:0
TX bytes:126 acl:0 sco:0 commands:30 errors:0

sudo hciconfig hci0 up
Can't init device hci0: Operation not supported (95)

rfkill list
0: hci0: Bluetooth
Soft blocked: no
Hard blocked: no
1: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no

Is this a regression. Or does it work in different way with 4.x?

Regards,

Norbert