powernow not working on AMD Athlon XP Mobile

[Maurizio Lombardi]

Hi,

I installed DFly on an old laptop with an AMD Athlon XP-Mobile processor,
unfortunately I'm unable to scale down the processor frequency, it's a
problem for me because it makes the laptop to become very hot.

First of all, I tried to load the powernow kernel module:

#kldload powernow.ko

but it returns the following error: "powernow: no power states found".

#sysctl -a |grep px

hw.acpi.cpu.px_dom0.available: 1867 1463 1067 800 665 533
hw.acpi.cpu.px_dom0.members: cpu0

There are no .current and .target entries and indeed I'm unable to set
the frequency I need.
Note: frequency scaling works under FreeBSD.

Is there something I can do to solve the problem (or maybe to help a
kernel developer to find the bug)?

Please cc me because I'm not subscribed to the list.

Thanks for your help.

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Maurizio Lombardi