From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1030201AbVHJTDS (ORCPT ); Wed, 10 Aug 2005 15:03:18 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1030202AbVHJTDS (ORCPT ); Wed, 10 Aug 2005 15:03:18 -0400 Received: from prgy-npn1.prodigy.com ([207.115.54.37]:39950 "EHLO oddball.prodigy.com") by vger.kernel.org with ESMTP id S1030201AbVHJTDR (ORCPT ); Wed, 10 Aug 2005 15:03:17 -0400 Message-ID: <42FA5094.4010702@tmr.com> Date: Wed, 10 Aug 2005 15:08:04 -0400 From: Bill Davidsen User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.8) Gecko/20050511 X-Accept-Language: en-us, en MIME-Version: 1.0 Newsgroups: gmane.linux.kernel To: Pavel Machek CC: linux-kernel@vger.kernel.org Subject: Re: Power consumption HZ100, HZ250, HZ1000: new numbers References: <20050730004924.087a7630.Ballarin.Marc@gmx.de> <20050730100658.GB1942@elf.ucw.cz> In-Reply-To: <20050730100658.GB1942@elf.ucw.cz> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Pavel Machek wrote: > Hi! > > >>I was finally able to get C3 state working. It seems that my BIOS is >>leaving USB controllers in an active state(?). Without any USB drivers >>loaded, C3 is not possible. With drivers loaded, but no device plugged >>in C3 works fine. Kernel is 2.6.13-rc3-mm3 + acpi-sbs. >> >>With working C3 there are indeed differences: >> >>Voltage is 16.5 V >> >>HZ=100: ~460 mA => 7.59 W >>HZ=250: ~468 mA => 7.72 W >>HZ=1000: ~494 mA => 8.15 W > > > 0.55W difference, wow. And that's 7% difference to overall system > consumption. But it's totally meaning less isn't it? Disable the USB, there goes the kb/mouse, turn off the LCD you can't see anything, spin down the disk, you can't do i/o, and run the CPU in idle so you can't DO anything. At that point you might as well turn it off and save 100%.