Re: Changing temperature trip points

Hi!

quoted

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?

YOU are right that I need to turn the polling on.

But I'm sure fan is done by bios on my machine.

Here is what my cool-it-down script looks like:

root@amd:~# cat watchtemp
#!/bin/bash
echo "83:83:60:70:0" > /proc/acpi/thermal_zone/THRM/trip_points
echo "5" > /proc/acpi/thermal_zone/THRM/polling_frequency
watch '( cat /proc/acpi/processor/CPU0/limit ; cat
/proc/acpi/thermal_zone/THRM/{temperature,state,trip_points} )'
root@amd:~#

						Pavel

-- 
Casualities in World Trade Center: ~3k dead inside the building,
cryptography in U.S.A. and free speech in Czech Republic.


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