I did an upgrade to F11 from F10 yesterday. I was a bit shocked after selecting an upgrade that Anaconda just went off and did it.
Anyway, went fine except for wireless not working. modprobe iwlagn produced a bunch of errors including:
kernel: cfg80211: Unknown parameter `ieee80211_regdom'
I found this:
and then commented out:
options cfg80211 ieee80211_regdom=US
modprobed iwlagn again and fixed.
Hope this helps some one else. I think it would only occur on an upgrade to F11.