[ubuntu] ubuntu is sucking up battery very fast

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http://ubuntuforums.org – hey all, i have installed ubuntu 12.04, back then i was using win 7, and my battery backup was good about 3-4 hr, but using ubuntu it is merely 45 mins... :mad::mad::mad::mad: i there a way to calm it down :p -> using dell vostro 1088, 32 bit,intel core2 duo, 2GB RAM (Hardware)