[ubuntu] help needed

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http://ubuntuforums.org – i am to buy a laptop and planning to have dell inspiron 15R with Core i5(3rd gen)/ 4 Gb RAM/ 1TB HDD/AMD Radeon 8482; HD 7670M DDR3 GPU. with win7. now i am to install ubuntu along side the win7, now i have read that the GPU doesnt support ubuntu and when we boot with ubuntu, the system starts heating and fan speeds up unusually because the GPU runs by default and is incompatible with ubuntu. (occasionally would also like to run Backtrack live CD/USB will it work?) now my dilemma is that are these news really true? and would this be solved with updates of ubuntu?????:confused::confused:: (Hardware)