It's called speedstep usually. Most newer laptops have some variant of it. Properly configured it should reduce your processorspeed(and batteryusage) on battery and give you full blast with the wall plug connected.
Check both bios and my computer -> properties -> advanced -> power settings.
If you've reinstalled your laptop you may have to install drivers to get it to work properly. On my dell x200 they had bundled speedstep/hibernate drivers with the graphic driver(how.. logical).
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There is a spoon.
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