title: iwlist scan return no result (ra0)
body: <p>I'm trying to run the following command <code>iwlist ra0 scan</code> (ra0 = WLAN 5GHz) and I get as output:</p>
  
  <blockquote>
    <p>ra0       No scan results</p>
  </blockquote>
  
  <p>There is my configuration:</p>
  
  <pre><code>pi@raspberrypi:~ $ iwconfig
        ra0       Ralink STA  ESSID:""  Nickname:"MT7610U_STA"
                  Mode:Auto  Frequency=2.412 GHz  Access Point: Not-Associated
                  Bit Rate:1 Mb/s
                  RTS thr:off   Fragment thr:off
                  Link Quality=10/100  Signal level:0 dBm  Noise level:0 dBm
                  Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
                  Tx excessive retries:0  Invalid misc:0   Missed beacon:0
  
  pi@raspberrypi:~ $ ifconfig
        ra0       Link encap:Ethernet  HWaddr 01:23:45:67:89:ab
                  inet addr:169.254.185.103  Bcast:169.254.255.255  Mask:255.255.0.0
                  inet6 addr: fe80::f6dd:c143:6e27:d133/64 Scope:Link
                  UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
                  RX packets:0 errors:0 dropped:0 overruns:0 frame:0
                  TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
                  collisions:0 txqueuelen:1000
                  RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)
  
  pi@raspberrypi:~ $  uname -a
        Linux raspberrypi 4.4.34-v7+ #930 SMP Wed Nov 23 15:20:41 GMT 2016 armv7l GNU/Linux
  </code></pre>
  
  <p>Does someone know how to manage to make it work?</p>