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

[Török Edvin]

On 6/21/07, Adam Sloboda <ja at disorder.sk> wrote:
> Same chipset but no effect here.  Normally I have this vales at a0:
>
>  a0: 24 06 00 00 00 00 00 00 13 1c 0a 00 00 03 00 00
>
> after running 'setpci -s 00:1f.0 a0.w=a8' i got:

Oops, I wanted to say a0.b, I changed only the low-order byte. Sorry
for the typo.

>
>  a0: a8 02 00 00 00 00 00 00 13 1c 0a 00 00 03 00 00
>
> What values do you normally have and how do they change?

I have
a0: 20 02 .....

What you need to do, is set bits 7, and 3, which in your case would
mean 24 -> ac.
You should also leave the value at a1 alone, set it back to 06.
Does that help?

--Edwin