linux-kernel - Re: [announce] Intel announces the PowerTOP utility for Linux

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Date:	Mon, 14 May 2007 22:22:50 +0200 (MEST)
From:	Jan Engelhardt <jengelh@...ux01.gwdg.de>
To:	Alistair John Strachan <s0348365@....ed.ac.uk>
cc:	Arjan van de Ven <arjan@...ux.intel.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-acpi@...r.kernel.org
Subject: Re: [announce] Intel announces the PowerTOP utility for Linux


On May 12 2007 22:12, Alistair John Strachan wrote:
>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?

At its worst, it _is_ the USB chip that draws the power when it is active
(when uhci_hcd is loaded); does not need to be usbhid or so.


	Jan
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