Re: Changing temperature trip points

On Sun, Nov 03, 2002 at 08:56:16PM +0100, Pavel Machek wrote:

Hi!

quoted

I did in fact try that, and while it lets me change the values, they
don't actually seem to affect the kernel's idea of when the fan should
come on, if at all.  I set the active trip point to 45 C and the passive
to 50 C, then ran a compile to see if the fan triggered.  While the
temperature got above 50 C, the fan never came on.  In fact, I don't
know if the fan would come on even if the originally-specified trip
points were reached.  Either way, this isn't exactly the most comforting
situation to observe.

That's because your fan is driven by hardware, not ACPI. I see it
here, too. Passive cooling should work, through.

Actually, I think the problem is something else: The BIOS is supposed to
generate ACPI events whenever these trip points are reached. So if you
change these values (by patching the DSDT, by "hardwiring" it into the
kernel) you need to use the polling method. Then ACPI will compare the
current temperature to the specified temperatures with a specified
frequency. Any chance you can try whether my assuption is correct?

	Dominik


-------------------------------------------------------
This SF.net email is sponsored by: ApacheCon, November 18-21 in
Las Vegas (supported by COMDEX), the only Apache event to be
fully supported by the ASF. http://www.apachecon.com