Comment 11 for bug 306719

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John S. Gruber (jsjgruber) wrote :

@David Bensimon
I had the same problem, including the "failed to wakeup the MAC Chip" message.

 I discovered that I had the proprietary Atheros driver enabled in Hardware Drivers. I saw from the log that its ath_pci was starting before ath5k. When I disabled the proprietary driver in System->Hardware Drivers and rebooted, (or when I blacklisted ath_pci and ath_hal in a new file in /etc/modprobe.d), ath_pci didn't start and ath5k gave no error and, indeed, worked.

Have you tried that?