Armada 17xx, ACPI thermal management broken.

Nikolas Britton freebsd at
Tue Dec 21 04:25:13 PST 2004

I have a Compaq Armada 1750 laptop and ACPI is some what broken. If I 
enable ACPI the fan will never run causing the system to overheat and 
shutdown, there are a few other problems with ACPI but this is the major 
one. This is a standard 440BX/MX chipset (82443BX) so I don't understand 
why this doesn't work yet with FreeBSD, Is this a problem with my 
DSDT/AML/ASL whatever? The work around in the bug report I submitted ( ) does not work if 
the system is below the hw.acpi.thermal.tz0._ACx threshold, if it is 
below this threshold at system boot the fan will NEVER turn on even if is set in loader.conf.

Any help would be appreciated on ether fixing this problem or a way to 
use ACPI but disable the thermal monitoring so the system can control 
the fan?

Also... in the bug report there is a link to a Linux kernel patch that 
fixes this problem.

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