From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965647AbXA3Rl4 (ORCPT ); Tue, 30 Jan 2007 12:41:56 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S965648AbXA3Rl4 (ORCPT ); Tue, 30 Jan 2007 12:41:56 -0500 Received: from smtp102.sbc.mail.mud.yahoo.com ([68.142.198.201]:43866 "HELO smtp102.sbc.mail.mud.yahoo.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S965647AbXA3Rlz (ORCPT ); Tue, 30 Jan 2007 12:41:55 -0500 X-YMail-OSG: iyAHHJwVM1ll8EXcM.qSBHYv6TdK3MF1ODOu9KG3jXHsWOvVWhyExO5oCmKGx9YT5wA- Message-ID: <45BF81CF.2060801@dogpad.net> Date: Tue, 30 Jan 2007 11:35:11 -0600 From: Joe Harvell User-Agent: Thunderbird 1.5.0.9 (X11/20061230) MIME-Version: 1.0 To: linux-kernel@vger.kernel.org Subject: ACPI C and P states on Conroe Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org I am trying to enable all the power saving features I can on my Conroe E6600. After much searching on the web, I am a little confused about the Linux kernel support for ACPI on the Conroe. Here is my setup: Intel Core2 Duo E6600 Asus P5-B Deluxe board (Intel P965). I am running a Gentoo kernel based on 2.6.19.4. I have managed to enable EIST using cpufreq with the speedstep-centrino driver. But my understanding from browsing the ACPI spec is that this is still within C0, i.e. not much power savings. Here are my questions: 1) For P states, which cpufreq driver should I be using? I've heard speedstep-centrino is deprecated (but only some aspects of it) that are being moved into acpi-cpufreq. But I can't get acpi-cpufreq to load in my kernel version. Also, I would have thought speedstep-ich would be the driver, just based on the name. How do I know (other than trying all modules to see which one loads) which one I should be using? 2) What kind of support for C1-C3 does the Conroe have? The ACPI spec says C2 and C3 require chipset support on the motherboard. Does P965 have that. Does it matter between boards (e.g. P5B)? 3) What versions of the kernel support C1-C3 states? What kernel options are germane to this? What libraries/tools are involved? --- Joe Harvell