NetworkManager v. Dell Hair Puller Solved

[Fedora User]

This may help others fix a problem with a Dell laptop, Broadcom wifi and
NetworkManager. Special thanks to Jirka Klimes for insight and patience.

Here were the symptoms:

1. WiFi worked without NM but not with it.
2. "Enable wireless" was grayed out in the NM applet.

The solution is simply to blacklist dell_laptop
in /etc/modprobe.d/broadcom-wl-blacklist.conf

Exactly why this is necessary with NM but not without will remain one
of life's mysteries along with understanding Sarah Palin's appeal and
Glenn Beck's ratings (and rantings).