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Date: Wed, 23 Jan 2002 14:19:06 +0100 (CET)
From: Daniel Nofftz <nofftz@castor.uni-trier.de>
X-X-Sender: nofftz@hades.uni-trier.de
To: Vojtech Pavlik <vojtech@suse.cz>
cc: Timothy Covell <timothy.covell@ashavan.org>,
        Dieter N?tzel <Dieter.Nuetzel@hamburg.de>, Dave Jones <davej@suse.de>,
        Andreas Jaeger <aj@suse.de>, Martin Peters <mpet@bigfoot.de>,
        Linux Kernel List <linux-kernel@vger.kernel.org>
Subject: Re: [patch] amd athlon cooling on kt266/266a chipset
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On Wed, 23 Jan 2002, Vojtech Pavlik wrote:
> Won't ACPI idle do that well enough?

yes ... and no!
first: my patch is useless, if you don't activate acpi idle calls ...
second: the idle calls will not save power on an athlon/duron/athlon xp ,
unless a specific bit in the chipset is set, which will cause the chipset
to disconnect the frontside bus of the cpu ... and this is what the patch
does: it sets only the bit in the northbridge of the kt133/kx133 and
kt266/266a chipset ... -> now the acpi idle calls will bring power saving
and lesser temperature
the patch inserts a pci_quirk function which sets the bit in the
northbridge ... (at the boot-prompt you have to pass the comment
amd_disconnect=yes to use this function ...)

daniel

# Daniel Nofftz
# Sysadmin CIP-Pool Informatik
# University of Trier(Germany), Room V 103
# Mail: daniel@nofftz.de

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