It seems it's a bit intermittent...
$ iwlist wlan0 scan
wlan0 No scan results
$ sudo iwlist wlan0 scan
wlan0 No scan results
(few minutes wait)
$ sudo iwlist wlan0 scan
wlan0 Scan completed :
Cell 01 - Address: 00:0C:41:D8:F3:0D
ESSID:""
Mode:Master
Channel:6
Frequency:2.437 GHz (Channel 6)
Quality=58/100 Signal level=-73 dBm Noise level=-127 dBm
Encryption key:on
Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s
Extra:tsf=000000664ab3523e
$ sudo iwlist wlan0 scan
wlan0 Scan completed :
Cell 01 - Address: 00:0C:41:D8:F3:0D
ESSID:""
Mode:Master
Channel:6
Frequency:2.437 GHz (Channel 6)
Quality=59/100 Signal level=-72 dBm Noise level=-127 dBm
Encryption key:on
Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s
Extra:tsf=000000664b70623b
$ iwlist wlan0 scan
wlan0 No scan results
(few minutes wait)
$ sudo iwlist wlan0 scan
wlan0 No scan results
$ sudo iwlist wlan0 scan
wlan0 Scan completed :
Cell 01 - Address: 00:0C:41:D8:F3:0D
ESSID:""
Mode:Master
Channel:6
Frequency:2.437 GHz (Channel 6)
Quality=80/100 Signal level=-54 dBm Noise level=-127 dBm
Encryption key:on
Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s
Extra:tsf=00000066515c0237
--
[hardy] iwl3945 fails reporting networks with iwlist wlan0 scan
https://bugs.launchpad.net/bugs/192119
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