I experienced the same problem (one you turn off wifi with hotkey) in Natty on two Dells: Studio XPS 16 and Studio 15 and found that I could turn it back on by uninstalling the Broadcom driver and then reinstalling it again.
I experienced the same problem (one you turn off wifi with hotkey) in Natty on two Dells: Studio XPS 16 and Studio 15 and found that I could turn it back on by uninstalling the Broadcom driver and then reinstalling it again.