Messages in this thread | | | Subject | RE: Inspiron 6000 and CPU power saving | Date | Thu, 19 Oct 2006 10:26:54 -0700 | From | "Pallipadi, Venkatesh" <> |
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>-----Original Message----- >From: linux-kernel-owner@vger.kernel.org >[mailto:linux-kernel-owner@vger.kernel.org] On Behalf Of >Michael (Micksa) Slade >Sent: Sunday, October 15, 2006 7:18 PM >To: linux-kernel@vger.kernel.org >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 >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. > >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 >numbers. That >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. > >Mick. >
Output of #cat /proc/acpi/processor/CPU0/power/* And #cat /sys/devices/system/cpu/cpu0/cpufreq/* 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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