Why does my MBP hibernate when the power flickers

I usually have my computer (MBP 3,1) hooked up to a powered 4-port USB hub. If the power goes off then when it comes back on my computer hibernates. Unplugging the USB hub from the computer before the power comes back on is sufficient to prevent this. Why would it do this? (My battery is fine.)

The hub tries to pull the juice it needs from the MBP and it is overloading the bus. If you put the hub and anything connected to it and AC power on a UPS this will not happen.

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