>From: [email protected]ernel.org
>[mailto:[email protected]] On Behalf Of
>Michael (Micksa) Slade
>Sent: Sunday, October 15, 2006 7:18 PM
>To: [email protected]
>Subject: Inspiron 6000 and CPU power saving
>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
>suggest as much. These are the results I got for power consumption in
>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
>machine's BIOS has no APM so I can't try it for comparison.
>I've tried noapic and "echo n >
>/sys/module/processor/parameters/max_cstate", where n is 1 thru 4.
>Neither appear to have any affect.
>I need help digging deeper. I guess /proc/acpi/processor/CPU0/power
>could give some insight but I'm not sure how to read the
>and "learn about ACPI" is all I can figure out so far.
>So where to from here? I am prepared to spend a significant amount of
>time researching and resolving the issue, so feel free to suggest
>reading the ACPI spec or whatever if that's what it's going to take.
Will be a good starting point.
Also, open a issue at bugme.osdl.org. It makes tracking the issues
easier that way.
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