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

[Dietz Proepper]

Thomas Meyer:
> To make it clear to anybody:
>
> The reported ACPI state has absolutely nothing to do with the connected
> CPU MWAIT state. It's defined in the ACPI firmware which value is passed
> to the MWAIT command for which ACPI C-state!
>
> So for the macbook pro C3 will put the Intel Core cpu into CPU C-state
> C4.

Is there a simple way to see the C-state mapping?