Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Wed, 26 Jun 2002 17:38:14 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Wed, 26 Jun 2002 17:38:14 -0400 Received: from stateless2.tiscali.cz ([213.235.135.71]:18379 "EHLO mail.tiscali.cz") by vger.kernel.org with ESMTP id ; Wed, 26 Jun 2002 17:38:13 -0400 Date: Wed, 26 Jun 2002 23:27:00 +0200 From: Stanislav Brabec To: Daniel Nofftz Cc: linux-kernel@vger.kernel.org Subject: another way to activate AMD disconnect on VIA KT266 (aka cooling bits) Message-ID: <20020626212659.GA3565@utx.vol.cz> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.3.28i X-Accept-Language: cs, sk, en Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2112 Lines: 70 Hallo, I have been experimenting with AMD disconnect with my VIA KT266 based MSI K7T266Pro (MS-6380). LVCool does not yet support KT266, method discussed in LKML in past (http://cip.uni-trier.de/nofftz/linux/Athlon-Powersaving-HOWTO.html) does not activate low power mode on my mainboard. The only bit set by this patch is already set probably by BIOS of my motherboard and does not help. So I have checked VCool (http://vcool.occludo.net/) & Wine & lspci and found following bit changes: enable: setpci -v -H1 -s 0:0.0 70=86 setpci -v -H1 -s 0:0.0 95=1e disable: setpci -v -H1 -s 0:0.0 70=82 setpci -v -H1 -s 0:0.0 95=1c The result is 15 degrees temperature decrease on low system load! I don't know exactly, what I am doing (and chipset docs are not available), explanation is welcome, (un)success stories for other motherboards too. It works with both APM and ACPI. Stability issues: Allthrough I have experienced visible unstability of video voltage (unstability of white on PCI video card) on periodic high load (e. g. software OpenGL screensaver), the machine seems to be stable for one week. No sound skips nor DMA slowdown was observed. For unknown reasons, the system is stable only for whole number in processor multiplier. For half-number multiplier system sometimes crashes. Notes: 1) I have no feedback from VCool author (Martin Peters ). 2) The method discussed in past (by Daniel Nofftz ), which should work with ACPI (but not for me) is: VIA KT133/133A a KX133: enable: setpci -v -H1 -s 0:0.0 52=EB disable: setpci -v -H1 -s 0:0.0 52=6B VIA KT266/266A: enable: setpci -v -H1 -s 0:0.0 92=EB disable: setpci -v -H1 -s 0:0.0 92=6B 3) You can see also Fan Speed Control Daemon (stupid AWK script, but working): http://www.penguin.cz/~utx/fanscd -- Stanislav Brabec http://www.penguin.cz/~utx - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/