> I would like the effect to be nearly instant, but if it's not instant
> that's okay. And I'd like to avoid monitoring a dependent variable like
> hw.sensors.acpibat0.power0 and then checking the A/C status every time a
> change is detected.

sensors do not update instantly.  They are serviced in a loop by
a thread.  but it happens soon enough.  use 'systat sens 1' to watch.

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