In my try to enlarge my battery duration on my laptop, im using the powertop utility (http://www.linuxpowertop.org
But it says to me:
"Detailed C-state information is only available on Mobile CPUs (laptops)"
I have my kernel configured whith CPU_FREQ support, al the cpu governor, ACPI support.
I dont know how to make it works.
(Another thing that dont works is the xfce4-cpufreq plugin, i think because the same cause)
Whith a previous kernel compilation all it works, but in the new one not.
PS: Sorry my bad english