quoted

is everyone *totally* sure that activating the fan is entirely handled in
hardware? is there no
register for controlling the threshold?

I've seen nothing in Apple's own Darwin OS related to controlling the
powerbook fan neither. However, they do have code that use the CPU's
temperature sensors to control the ICTC (instruction cache throttling).

Which would be not-so-useful to control the temperature of the ethernet
chip, right? The PowerPC CPU isn't the primary source of heat in a laptop.
At least not to the extend the Intel CPU would be.
CPU temperature monitoring wouldn't be too useful either - the CPU
core always runs a lot hotter than the rest of the motherboard.

But I'm mostly guessing here - has anybody stuck a couple of temperature
probes on a PB motherboard and really measured the operating temperature?
What would the best 'hot spots' be for such an experiment?

	Michael


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