You need the madwifi openhal driver for that chip. (if the ath5k Doesn't work for you)
http://madwifi-project.org/ticket/1192
This driver works great, that chip is in a lot of the Netbooks.
I do not believe network-manager works with this driver though,
wicd has been recommended as a replacement, and I actually like it better than network manager, so win-win for me.