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Hello,

>   * On some platforms, model-specific ASICs can be used to power-{up,
>     down} otherwise MI devices. This is the case for prep and sparcbook
>     (thanks garbled@ for the examples). Powerhooks don't provide a 
> clean
>     way to handle this (ie run MD handler and driver's MI powerhook).

This is also the case with many Apple laptops. There's a bunch of 
registers to stop PCI or FireWire clocks, power down devices etc.

have fun
Michael
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