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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 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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