Unable to switch to wireless

[Geoffrey Leach]

ASUS Z84F, wireless built-in. Normally I connect to my Netgear router 
via ethernet. Nm-applet (Fedora 10) reports wireless connection.

Problem: if I unplug the ethernet connection, the system does not 
switch to wireless. If I re-boot with the ethernet unplugged, 
wireless works fine, and if I re-plug the ethernet connection, it 
switches over correctly. And back to wireless, etc.

Behavior is lost when I suspend or hibernate.

Any suggestions? (It's not a BIOS issue.)