Re: reducing power usage of Fedora - how you can help!

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Justin W wrote:
Bill Nottingham wrote:
...

4) Report the results. You can add reports here, on #fedora-devel,
   or to the upstream powertop community at power@xxxxxxxxxxx or
   #powertop on irc.oftc.net.
...
I read at Intel's site about powertop that having activities in C-states 3 and 4 are best, but I don't have either. I'm curious as to know why I


from
http://ww.linuxpowertop.org/faq.php
(middle of the page)

Q.
I see only C0, C1, and C2. Why don't the other C-states show?

A.
It's mostly a BIOS thing. Some BIOS hide C3/C4 when on AC power, and others show only C3 which is really a C4 underneath when on battery. Note that the 'max_cstate:C8' value in /proc/acpi/processor/*/power tells the maximum number of C-states the Linux kernel can handle, not the number of C-states implemented in your hardware.

--
     Ronald

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