On Tuesday, December 14, 2004, at 08:48 AM, Michael wrote:

> Hello,
<...>

> Stupid question - is this power saving stuff active for G4 CPUs? My 
> iBook doesn't cool down when being idle, it only seems to heats up a 
> little slower than under full load.
<...>

I've been wanting to post about this for a while,  I've noticed that if 
I boot my ibook into OSX after using Netbsd, the fan always kicks in, 
and runs for a few minutes, it also does this after prolonged sessions 
in openfirmware.  One time, I was trying to make bootmenu in OF forth 
and spent maybe over an hour in OF, at which time it got kind of 
flakey, as if keys were sticking -- I booted in OSX to let it cool 
down, and the fan ran for about 20 minutes...
Typically the fan never comes on, in OSX, unless I make heavy use of 
the cdrom.

Netbsd-wise, I'm a little concerned if OSX feels the machine is hot 
enough for some fan, unless its something else, like OSX sees different 
values in fan related registers/varibles than it uses, and just 
defaults to running the fan for a few secs..