From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1760150AbXELVM4 (ORCPT ); Sat, 12 May 2007 17:12:56 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754696AbXELVMt (ORCPT ); Sat, 12 May 2007 17:12:49 -0400 Received: from smtp.bulldogdsl.com ([212.158.248.8]:1082 "EHLO mcr-smtp-002.bulldogdsl.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754252AbXELVMt (ORCPT ); Sat, 12 May 2007 17:12:49 -0400 X-Spam-Abuse: Please report all spam/abuse matters to abuse@bulldogdsl.com From: Alistair John Strachan To: Arjan van de Ven Subject: Re: [announce] Intel announces the PowerTOP utility for Linux Date: Sat, 12 May 2007 22:12:43 +0100 User-Agent: KMail/1.9.6 Cc: Linux Kernel Mailing List , linux-acpi@vger.kernel.org References: <4644F726.1050806@linux.intel.com> In-Reply-To: <4644F726.1050806@linux.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200705122212.43653.s0348365@sms.ed.ac.uk> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Saturday 12 May 2007 00:07:18 Arjan van de Ven wrote: > What's eating the battery life of my laptop? Why isn't it many more > hours? Which software component causes the most power to be burned? > These are important questions without a good answer... until now. This is a really great tool and presents a very intuitive alternative to the timer stats file.. On a Core 2 Duo Macbook, Linux always gets around 3.2h battery, OS X about 4.2h. This tool has identified that uhci_hcd is where 75% of the ticks are going when X is not loaded. Unloading uhci_hcd drops the battery life back to around 4.2h, but I lose the keyboard. Is there any way to find out what USB driver is causing usb_uhci to be this busy? (BTW, the link to Keith's patch for dhcdbd seems to be broken on your homepage.) -- Cheers, Alistair. Final year Computer Science undergraduate. 1F2 55 South Clerk Street, Edinburgh, UK.