Comment 54 for bug 373680

I'm sorry, I finally understood that this bug is not fixed, but instead there's a workaround (to lock the BSSID). Perhaps someone with the correct authorisation could write a note about this workaround for the bug description at the top of the page? It might save other users' time. For example:

If you suffer from this problem, and you use a wireless network with only one access point, then there is a workaround: in Network Manager, edit the network connection, and fill in the BSSID of your access point. (This can be obtained by running the command "iwconfig" in a terminal.) This stops Network Manager from scanning for other access points, and hence should alleviate the symptoms of the underlying bug. The "real" fix is for the card's network driver not to take so long to scan for other APs, but some drivers have not yet (and may never be) fixed.

(I can't find an easier way to get the BSSID; please feel free to edit the above if there is one!)