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SubjectRE: Variable ticks
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>>>Question one, are there other actions to consider?
>>
>>
>> Yes.
>> Speaking for ACPI C3 state, note that DMA also
>> wakes up the CPU -- even if there was no device interrupt.
>> (aka, "the trouble with USB")
>
>Trouble? Why would USB do DMA unless there was a device activity?

look here:
http://www.google.com/search?hl=en&q=usb+selective+suspend

Linux is working on it too, but it is in development.

cheers,
-Len
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