Re: understanding acpi

[Oliver Henriot <Oliver.Henriot@imag.fr>]

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Hi,

Rodney Cacy a écrit :
> I'm not an expert but you can pass a boot kernel option:
>
> processor.max_cstate
Yes, I'd actually tried setting processor.max_cstate=4 a while ago to 
see if this changed anything and indeed, instead of reading
max_cstate : C8
from /proc/acpi/processor/CPU0/power as I usually get, I got
max_cstate : C4
Obivious, and no good either, unfortunately. I still ran at C2 on mains 
and C3 on battery.
I suspect my settings in /etc/acpi are not good and I'm looking for a 
fine manual I could rtfm in order to understand what I should doo to 
fine tune acpi on my machine. Where I'm stuck is to find the fine manual 
which I'll actually understand (I may not be very smart... ;-) ) and 
manage to put into application.
> More inforamtion in 
> http://www.columbia.edu/~ariel/acpi/acpi_howto.txt, section 7.
Yes, I'm actually trying to understand sections 6.3 through 6.6 of that 
same document, which I suspect are precisely what I'm looking for and 
also point at /etc/acpi. My relatively limited skills are preventing me 
from getting any further at the moment, but I am confident I will 
eventually make something of it.
> 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

Cheers,

P.S. considering the level of other discussions on this list, I suspect 
I have pointed my questions to the wrong place. Question : is there a 
noob oriented discussion list for acpi? Anyway, sorry for the list 
pollution with such "low level" questions.
>
>
> 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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>
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