No C4 State with Powertop

[bi0]

Arjan van de Ven wrote:
> Hi,
>
> it depends on your BIOS. Some bioses don't enable C4 when you're on AC
> (mains) power, but only when you're on battery. Other bioses silently
> remap C3 to be hardware-C4 when you're on battery, and will never show
> C4, even though it'll go to C4 when Linux asks for C3 when on battery..
>
> yes I know it's confusing.. I'll see if I can write up a small article
> about this with information
>
Hi,

thank you for your answer. I'm testing powertop while I'm on battery
power. The /sys/module/processor/parameters/max_cstate
file tells me I should have 8 C-States. So does my computer only use
three, or are 5 of them shown as C-3? If so, is there
a way to get more detailed information?

bye,
Jannis