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Atheros power management

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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.

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