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Date: Tue, 10 Jun 2008 16:29:30 -0400 (EDT)
From: Len Brown <lenb@kernel.org>
Subject: Re: acpi problem
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To: "Rafael J. Wysocki" <rjw@sisk.pl>
Cc: De Martino Pasquale <paco.dmp@gmail.com>, linux-kernel@vger.kernel.org,
       ACPI Devel Maling List <linux-acpi@vger.kernel.org>
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> > with kernel 2.6.25 my acpi does not work whereas with version <= 2.6.24 all works fine.
> > 
> > Full description:
> > when i run acpi -a this is my output:
> > No support for device type: battery
> > No support for device type: ac_adapter

what do CONFIG_ACPI_BATTERY and CONFIG_ACPI_AC say in your 2.6.24 and 
2.6.25 .config files?

> > "lsmod | grep acpi" says that the acpi module is not loaded so i've tried
> > "modprobe acpi" but the output is:

there is no such thing as the "acpi module", so this is normal

> > FATAL: Error inserting acpi_cpufreq
> > (/lib/modules/2.6.25-2-amd64/kernel/arch/x86/kernel/cpu/cpufreq/acpi-cpufreq.ko):
> > Device or resource busy

that's normal, since you've got powernow_k8 loaded

> > I've also tried to pass acpi=on option when kernel boots

there is no such option as "acpi=on", so this is also normal.

"dmesg -s64000 |grep -i acpi" will tell you more about what you
just booted, but since you're running the fan and thermal modules,
it is surely on already.

-Len