What service can hold CPU at lowest frequency possible when on battery load under Ubuntu?

What service can hold CPU at lowest frequency possible when on battery load under Ubuntu? When I'm running on battery even with "performance" frequency scaling governor, something regularly lowers CPU speed to it's lowest value. I don't really want that, my AC strip usually in another room so I don't really need to save power. How can I find what service doing that?
Asked by: Guest \| Views: 304

Total answers/comments: 2

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Guest [Entry]

Turns out there was a setting in a BIOS I set and completely forgot about. It is called "SpeedStep management" or something similar, and it was set to "Optimize Battery" when on battery. Switching it to automatic completely cured the problem.

Guest [Entry]

"Is it Intel Centrino based laptop? It could be ""SpeedStep"" at work! In any case, you can check out EmiFreq-applet to control/set CPU frequency.
http://zzrough.free.fr/emifreq.php"