Comment # 16 on bug 1179308 from Dr. Werner Fink

(In reply to Clemens Famulla-Conrad from comment #15)
> Not sure if it helps, but maybe use iw tools directly like
> > iw dev wlan0 scan trigger freq 2472
> > iw dev wlan0 scan dump

smartmeter:~ # iw dev wlan0 scan trigger freq 2472
smartmeter:~ # iw dev wlan0 scan dump | grep -E 'SSID:|primary channel:'
        SSID: Claudia und Manuel
                 * primary channel: 1
        SSID: naduah
                 * primary channel: 1
        SSID: DOMINION
                 * primary channel: 1
        SSID: DIRECT-E1-HP OfficeJet Pro 8720
                 * primary channel: 4
        SSID: Mazsola
                 * primary channel: 4
        SSID: HP-Setup>ee-M277 LaserJet
                 * primary channel: 6
        SSID: DIRECT-25-HP OfficeJet Pro 8710
                 * primary channel: 6
        SSID: ZYXEL-098
                 * primary channel: 6
        SSID: Art
                 * primary channel: 6
        SSID: Obi.net
                 * primary channel: 9
        SSID: 
                 * primary channel: 9
        SSID: FRITZ!Box 7590 UV
                 * primary channel: 11

nope, that does not work either ...