There is a module called fan in the acpi stuff that can be compiled in
or the module is loaded.  A second thing to try is to compile the
kernel with apm support instead of ACPI and see if that helps.  I
don't know the specs for a T40 but I use a T42 and have had no
problems with just ACPI.

Also check out a module called ibm-acpi.  Get the latest version
through portage and that can give you control over your fan, at least
manually turn it on and off but this might be helpful.

If I can be of more help let me know,
Andrew

On 5/2/05, Cliff Rowley <cliffrowley@...> wrote:
> Hi Jordi, thanks for your speedy reply :)
> 
> Jordi Molina wrote:
> > Centrino CPU speed should be handled by a speed governor daemon  (have
> > a look at the ACPI guide at gentoo.org)
> >
> > Keep in mind that if you want to have battery for more time, it's
> > normal that this daemon reduces the CPU if its not used, the same
> > daemon will raise up the speed as soon as the current speed becames
> > too low (compiling, i.e.)
> 
> I should have explained better.  I've read the ACPI guide and set Gentoo
> up accordingly - and under normal usage the temperature is OK.  However
> if I start doing anything stressful, like compiling - that's when I end
> up creeping towards 80 degrees and possibly beyond (I daren't let it get
> any hotter).
> 
> I do a lot of software dev, and a lot of compiling under win32 - but I
> never encounter this problem.  Even if I set the processor to high
> performance (I use SpeedSwitchXP under Win32), the temperature is always
> acceptable.
> 
> I'm scared ;-)
> 
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