I've got a Atheros AR5B91 I'm looking to turn power management off.
On battery the card works fine but soon as i plug in my power adapter wifi is knocked off and finds no networks.
It seems my bios doesn't like Atheros card's (tried a few) it's the same in linux but if i
sudo iwconfig wlan0 power off
It works fine in linux.
My only other option is find a broadcom card compatible with mavericks as broadcom cards don't seem to have this problem with my bios.