Ubuntu 12.04 freezes, battery drain, and fan noise too loud

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http://askubuntu.com – i've been using ubuntu 12.04 for a few weeks now and there are some things i have noticed. Im running ubuntu on a dell n5010 (15R), with 3gb ram, intel core i3, intel hd graphics and ubuntu 64x bit. My battery drains too fast, last less than an hour, while in windows used to last 3:30. I also noticed that the battery capacity decreased in a week from 78% to 74%. I get my screen frozen sometimes at the ubuntu start screen, the purple one, with the 4 or 5 dots below the ubuntu logo. Also, fan noise increases randomly, sometimes without running anything on the background. Sometime, the freezes oc (HowTos)