linux-kernel - Re: Inspiron 6000 and CPU power saving

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Message-ID: <20061025094757.GA7658@elf.ucw.cz>
Date:	Wed, 25 Oct 2006 11:47:57 +0200
From:	Pavel Machek <pavel@....cz>
To:	"Michael (Micksa) Slade" <micksa@...bbits.org>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Inspiron 6000 and CPU power saving

Hi!

> I recently discovered that my Inspiron 6000 uses about 50% more power 
> idling in linux than in windows XP.  This means its battery life is 
> about 2/3 of what it could/should be.
> 
> I guessed it might be the CPU, and did some tests.  The results strongly 
> suggest as much.  These are the results I got for power consumption in 
> various situations.
> 
> linux idle at 800MHz: 27W        
> linux idle at 1600MHz: 36W        
> linux raytracing at 800: 30W
> linux raytracing at 1600: 42W 
> 
> windows idle (presumably 800MHz): 16W
> windows raytracing (presumably 1600MHz): 36W
> 
> I've tried ubuntu dapper and ubuntu edgy, and RIP 10 (rescue disk) and 
> BBC 2.1 (rescue disk), and they all appear to have the same issue.  The 
> machine's BIOS has no APM so I can't try it for comparison.

Let me guess, UHCI? Remove usb modules, and measure again.

For details, see 8hours on your lap presentation, linked from
http://www.livejournal.com/~pavelmachek .

								Pavel
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