From mboxrd@z Thu Jan 1 00:00:00 1970 From: Nebojsa Trpkovic Subject: Re: powernow-k8 manual voltage selection ? Date: Mon, 20 Dec 2004 16:48:15 +0100 Message-ID: <41C6F43F.4000306@gmail.com> References: <20041220141203.GO2140@poupinou.org> Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20041220141203.GO2140@poupinou.org> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: cpufreq-bounces@www.linux.org.uk Errors-To: cpufreq-bounces+glkc-cpufreq=gmane.org@www.linux.org.uk Content-Type: text/plain; charset="us-ascii"; format="flowed" To: cpufreq@www.linux.org.uk Bruno Ducrot wrote: >How you have done this? By powernow-k8 or via BIOS setting? If the >latter, I will not trust this input yet. You can verify this is OK via >cpufrequtils at >http://www.kernel.org/pub/linux/utils/kernel/cpufreq/cpufrequtils-0.1.tar.bz2 >then go to cpufrequtils-0.1/debug/x86_64 and issue a make, then ./powernow-k8-decode >as root. You must have the msr kernel driver loaded to get it working. > > I've done that by some software tool in window$ (I just didn't want to lock up system several times in my Gentoo :) ). By that tool (can't remember name) I was able to change multiplicators and voltages. I was monitoring voltages by other 2 tools and I could saw that my mobo overvolts CPU a little bit under heavy load, but it's about ~0.000V @0.800V, ~0.025V @1.100V and ~0.050V @1.5V I've tried to undervolt in BIOS and it worked, too. But, my BIOS allows only 0.9V and by software I was able to go under that voltage. Here you can see results (all of them passed few hours in prime): http://www.aaen.edu.yu/~tnt/graf.png Now, I'm running at 2.385MHz at 1.425V and under full load my lm_sensors show VCore = 1.46V I'll try to play a little bit more when I get 1 x 512MB module, as my mobo would lock up every time I try to change something on the fly with 2 modules. It's comon issue with Socket 754 boards. >Such patch will never reach mainline (but may be posted to this list for >reference purpose only). > > Yes... I guess so... I'm a little bit sad because linux becomes such conservative... Regards, Nebojsa