I have a Dell Inspiron 1520 with a Broadcom WiFi card BCM4311.
On the proprietary drivers list I can see that for the wifi card the bcmwl-kernel-source package is installed and used, but Network Manager lists only the wired connection and in a terminal I cannot see any WiFi device:
user@host$ iwconfig
eth0 no wireless extensions
lo no wireless extensions
Why this behavior if the driver is correctly installed?
