ubuntu@fjords:~$ rfkill list
0: sunxi-bt: Bluetooth
Soft blocked: no
Hard blocked: no
1: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
2: phy1: Wireless LAN
Soft blocked: no
Hard blocked: no
3: hci0: Bluetooth
Soft blocked: no <- was yes
Hard blocked: no
$ sudo rfkill unblock 3
$ hcitool dev
Bluetooth LE scan works!
0: sunxi-bt: Bluetooth
Soft blocked: no
Hard blocked: no
1: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
2: phy1: Wireless LAN
Soft blocked: no
Hard blocked: no
3: hci0: Bluetooth
Soft blocked: no <- was yes
Hard blocked: no
$ sudo rfkill unblock 3
$ hcitool dev
Bluetooth LE scan works!