I am using a MacBook Pro 8.2 with Ubuntu 12.04, and my wifi disconnects consistently. I followed the directions as detailed here here, however, and it works up to expected speeds, but after within an hours time, the wifi disconnects and the only way to solve the issue is to either reboot OR disable wireless and re-enable it.
lsmod | grep cfg80211
cfg80211 178818 2 b43,mac80211
I suspect that I did not blacklist the correct driver and there are two drivers causing instability, however I have no idea if I actually did it correctly.