this bug cause kernel module btusb not autoload.
$ lsb_release --all
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 14.04.2 LTS
Release: 14.04
Codename: trusty
$ uname -r
3.16.0-31-generic
$ lsusb | grep Bluetooth
Bus 007 Device 002: ID 0a12:0001 Cambridge Silicon Radio, Ltd Bluetooth Dongle
(HCI mode)
$ hciconfig
$ hcitool scan
Device is not available: No such device
$ lsmod |grep btusb
$ sudo modprobe btusb
$ lsmod |grep btusb
btusb 32497 0
bluetooth 446409 22 bnep,btusb,rfcomm
$ hcitool dev
Devices:
hci0 00:1A:7D:DA:71:10
good luck .
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https://bugs.launchpad.net/bugs/1221995
Title:
0a12:0001 Bluetooth Dongle (Cambridge Silicon Radio, Ltd) doesn't work
with 3.11 or 3.13 kernels
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