[ubuntu] Laptop heat and Fan speed drains battery

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http://ubuntuforums.org – Hi, I'm new to ubuntu. I was using opensuse earlier, started using ubuntu when I got my new dell inspiron 15R (5520) pre-installed with ubuntu 11.10. Am upgraded to 12.04 now. After upgrade to 12.04, the laptop is running very hot and fan is screaming away all the time, Battery life is so low that I have to use it plugged in, all the time. I have an AMD Radeon HD 7xxx graphics card. I have tired almost all that was available on the forums (all very vague to me) to solve the issue - including installing and trying both opensource as well as proprietary drivers. I have done an upgrade to 3.6 (Hardware)