An 'cat /proc/acpi/processor/CPU0/power' will give you:

active state:            C3
max_cstate:              C8
...

So the kernel (via ACPI I assume) is recognizing the additional power states.

I'm not sure if it is possible see the other states.

I found an (experimental) patch, that will use all power states.

From the description:
 "The new implementation considers the full menu of available c-states."

Here you will find it:

  http://www.thisishull.net/archive/index.php/t-203606.html

I haven't found time to test it.
It's against 2.6.18-rc4, so I don't know it it still works.

Please mail me any results you've got or if you find a newer version of the 
patch!

Regards
 Sven

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