Re: understanding acpi

Oliver Henriot
2006-12-04T14:21:15Z

[-- Attachment #1: Type: text/plain, Size: 3291 bytes --]

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
>> -
>> To unsubscribe from this list: send the line "unsubscribe linux-acpi" in
>> the body of a message to majordomo@vger.kernel.org
>> More majordomo info at http://vger.kernel.org/majordomo-info.html
>>
>>
>
>
> -
> To unsubscribe from this list: send the line "unsubscribe linux-acpi" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at http://vger.kernel.org/majordomo-info.html

[-- Attachment #2: S/MIME Cryptographic Signature --]
[-- Type: application/x-pkcs7-signature, Size: 4027 bytes --]