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Another (related) possible cause of a self-waking Mac
Authored by: alxx on Jul 31, '07 10:18:22PM
If you have a USB device which is externally powered, like a USB sound card, and you suffer from a short power outage, and that USB device will turn itself on after the outage -- then your Mac will wake up twice. First it'll wake up (running on batteries) when the external device goes offline, and then, assuming it had enough time to go back to bed, it'll wake up again when the power is restored into the external device and it powers itself on.

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