CPU C4 vs. C3 states, BIOS support and 1.5W power savings

[Peter Ganzhorn]

Seems you really know what you're talking about...have you ever 
considered writing a short howto about this? I don't know too much about 
ACPI and the DSDT, nor PCI registers...
Even a howto for advanced users would be useful I think because if you 
have it all summed up you can get the idea and read about details on 
some google-found websites for sure.
I'd really appreciate a little howto as I do have a ICH8-M chipset which 
will be different to yours I guess ;)

Peter


Török Edvin wrote:
> On 6/21/07, Florian Reitmeir <florian at reitmeir.org> wrote:
>>
>> it shows me max C3 in 2.6.21 , and 2.6.20 show me max. C4.
>
> 2.6.20 is not tickless IIRC, so C4 won't have a big impact.
>
> If you had C4 in 2.6.20, but not in 2.6.21 I suggest to open a
> bugreport on bugzilla.kernel.org.
>
> Perhaps use acpidump to dump the _CST tables. It is a bit complicated
> how to do that, you need to dump the SSDT, disassemble with iasl,
> locate the CST physical address, and length, dump again from that
> address, and decompile again.
>
> Are you using same BIOS with 2.6.21 vs. 2.6.20?
>
> --Edwin
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