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.
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