I've got an acer 6930 too.

As I understand it...

The pin-20 method should in theory work (google it - plenty of info around) which disables the hotkeys on the surface so the wifi will be constantly on from the card.

The problem we have, I've read, is that the card sits in a pci-e slot which isn't supported by Mac OS X and requires power to be supplied to it via the OS at startup. So effectively Mac OS doesn't turn the hardware on.

If I'm wrong I'll be happy, but this seems to be the general consensus as far as I'm aware.