From mboxrd@z Thu Jan 1 00:00:00 1970 From: "David Mathog" Subject: Save power at idle onTyan S2466N-MPX, athcool, etc. Date: Sun, 02 Oct 2005 11:29:15 -0700 Message-ID: Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Return-path: Sender: acpi-devel-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org Errors-To: acpi-devel-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , List-Archive: To: acpi-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org List-Id: linux-acpi@vger.kernel.org I'm currently on a quest to reduce the idle power usage on various machines here. For instance, using "athcool" on a 2.6.11-12mdk kernel (Mandriva 2005LE) on some Asus A7V266E machines it was possible to drop the idle temps from 57.5C to 39C. Flushed with success from that I next tried athcool on a single processor (athlon-MP 2200+) Tyan 2466N-MPX using a 2.6.8.1 kernel. No joy. It claimed to have changed the bits it controls but this didn't do a thing to the idle CPU temperature. Neither did turning those bits off, so it wasn't already in the low power state. This gives a pretty good clue why: % modprobe processor % cat /proc/acpi/processor/CPU0/info processor id: 0 acpi id: 0 bus mastering control: no power management: no throttling control: no limit interface: no /proc/acpi/processor/CPU0/power showed that only C1 was supported. On the ASUS boards both C1 and C2 were present. So my question is, has anybody managed to get the Athlon's "power saving at idle" mode working on this board? If so, which BIOS settings, kernel, modules, and other magic was needed to do so? Thanks, David Mathog mathog-7GExONQZ6ZKVc3sceRu5cw@public.gmane.org Manager, Sequence Analysis Facility, Biology Division, Caltech ------------------------------------------------------- This SF.Net email is sponsored by: Power Architecture Resource Center: Free content, downloads, discussions, and more. http://solutions.newsforge.com/ibmarch.tmpl