> > ACPI defines processor power-saving states C0, C1, C2 and C3. We cannot
> > enter C3 if there is busmastering activity, and so we check BM_STS. If this
> > is high when it should not be, and we are therefore not using C3, we are
> > losing battery life.
>
> USB causes continuous bus mastering.
OHCI tries to shut everything down; EHCI too. If those are
continuously mastering, it's a bug of some kind. I don't know
about UHCI though -- those drivers just seem to reset the
chip on suspend.
- Dave
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