hcitool lescan shows I/O error

Question

I\'m trying to do a lescan using hcitool on the raspberry pi.

The command prints out

Set scan parameters failed: Input/output error. 

Answer 1

To those finding this question now, it is fixed as of Bluez v5.41. All you need to to is download and install. You can download the lastest version from http://www.bluez.org/download/.