Comment 45 for bug 1221995

After upgrading the kernel using software updater today I found that "hcitools scan" has stopped saying "no such device". However the scan does not find any bluetooth devices. I tried with a phone and a tablet.

$ uname -a
Linux soni 3.16.0-30-generic #40~14.04.1-Ubuntu SMP Thu Jan 15 17:43:14 UTC 2015 x86_64 x86_64 x86_64

$ sudo dmesg -c > /dev/null

# plug in the BT dongle at this point

$ lsusb | grep "luetooth"
Bus 002 Device 004: ID 0a12:0001 Cambridge Silicon Radio, Ltd Bluetooth Dongle (HCI mode)
Bus 001 Device 003: ID 045e:0745 Microsoft Corp. Nano Transceiver v1.0 for Bluetooth

$ hciconfig
hci0: Type: BR/EDR Bus: USB
 BD Address: 00:1B:10:00:2A:EC ACL MTU: 1017:8 SCO MTU: 64:0
 UP RUNNING PSCAN
 RX bytes:512 acl:0 sco:0 events:23 errors:0
 TX bytes:336 acl:0 sco:0 commands:23 errors:0

$ hcitool scan
Scanning ...

$ echo $? # Nothing happened so see if there is error code...
0

$ dmesg
[ 899.894436] usb 2-1.7: new full-speed USB device number 4 using ehci-pci
[ 900.056153] usb 2-1.7: New USB device found, idVendor=0a12, idProduct=0001
[ 900.056158] usb 2-1.7: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[ 900.056160] usb 2-1.7: Product: Bluetooth V2.0 Dongle
[ 900.056163] usb 2-1.7: Manufacturer: Bluetooth v2.0

-Kedar