BlueAgent <blueagent@subdimension.com> writes:

> On Tue, Feb 11, 2003 at 11:04:28AM +0100, Ignatios Souvatzis wrote:
> > hi,
> 
> G'day,
> 
> > On Mon, Feb 10, 2003 at 10:47:08PM -0500, Perry E. Metzger wrote:
> > 
> > > What you'll need to do is to execute the appropriate ACPI method to
> > > assure that the fan is turned on when ACPI gets an event indicating
> > > that the temperature has gotten too high. See section 12 of the ACPI
> > > manual.
> > 
> > Yet another stupid design decision in PC hardware. Fans should auto-switch
> > on when the temperature is too high. Implemented in hardware. I guess we can't
> > circumvent this? (Other than keeping the fan always running)
> 
> I guess there should be some way to circumvent this, Windows seems to
> be able to control fan speed on my brand new HP Pavilion 724a. While
> running FreeBSD and going through POST, it runs at full speed, which is
> the default. When I boot Windows on it, the fan slows down as soon as it
> reaches the Windows XP splash screen, and it occasionally spins up when
> I'm doing something intensive. I've got no clue how well this sort of
> thing is documented, though.

I also see similar behavior with my Shuttle SS51G mini-pc.  Windows
will spin down the fan, but it runs at full tilt all the time in
NetBSD.

-russ