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Re: Powerbook produces a lot more heat after kernel upgrade

On Wed, Dec 01, 2004 at 09:39:39AM +1100, Benjamin Herrenschmidt wrote:
> On Tue, 2004-11-30 at 14:02 +0100, Richard Hult wrote:
> > Timo Reimerdes wrote:
> > > Could is be something related to hard-drive activity? Or is the
> > > processor just doing more work? did the powernowd change?
> > 
> > This is without running any frequency scaling at all (no powernod, 
> > cpydyn, or cpufreqd), and also without spinning down the hard drive. 
> > It's a bit of a mystery to me, I looked through the changelog for the 
> > kernel between 2.6.7 and 2.6.8 and didn't find anything obviously 
> > related to something like this.
> Note that a good way to lower the power consumption of a Mac laptop is
> to reduce HZ back from 1000 to 100 in include/asm-ppc/param.h

As it isn't standard set to 100, there must be some side-effects, could
you describe them?



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