On this gentoo howto they not only recommend using ATI's powerplay but
actually give some output that allegedly comes from running it:

http://www.gentoo-wiki.com/HARDWARE_Apple_MacBook#Underclock_ATI_graphic_card

I presume this is a reference to the MBP since the MB does not have an
ATI card.  When I run 'aticonfig --lsp' on my MBP C2D however I get:

Error: POWERplay is not supported on your hardware.

I'm doing everything at 32 bits - my system and the ati driver.  Has
anyone managed to get powerplay to work?  This might go a long way
towards saving battery life.

Also, my fan seems to constantly whir in the background (like now
;->).  I have applesmc installed but have left the fan's on automatic
so far.  I haven't figured out what units the temperatures
temperature_0-6 are in so I don't know if the fan's should be coming
on but it seems to me that they come on too quickly in Linux.  In OS X
the processor temperature can get very high before the fan's are
raised over 2000 rpms.  Does anyone have a way to get more reasonable
fan speeds - particularly for a C2D machine that heats up less?

thanks,
Sheer

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