Re: understanding acpi

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I'm not an expert but you can pass a boot kernel option:

processor.max_cstate

More inforamtion in http://www.columbia.edu/~ariel/acpi/acpi_howto.txt, section 7. Write me about the results. Now I'm working under suspending sound,lan etc. to save battery but soon I will work with the noise reduction.

Cacy


Oliver Henriot wrote:
Hi all list subscribers,

I'm looking for info on how acpi functions in order to get it to work the best possible on my computer. It's a Sony laptop (vaio vgn-sz3xp/c, core2duo) running Debian Etch. In particular, I'm looking for ways to reduce thermal dissipation from the CPU as much as possible, in order to queep the machine as quiet as possible. From the various docs I've read, so far I seem to understand that C-states is the way to go, throttling being probably not very efficient.

When I'm running on batteries, C3 state is active (as shown by cat /prc/acpi/processor/CPU0/power) and is the main state, whereas when I'm running on mains, C3 disappears and only C1 and C2 remain.

My question are : wouldn't it be better if I could use C3 even when on mains. Wouldn't it be even better with C4? As suggested by "Why My Cx Power State Is Not Used" I tried unloading various modules (e.g. those concerning usb but I got stuck with usbcore which refused to unload despite nothing usb being connected) without any success. Being relatively new to GNU/Linux, I'm a bit stuck here and don't know where to look or what to make of this.

Any help would be gladly welcome.

Cheers,

Oliver
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