Ubuntu 12.04.1 LTS fails to find Intel HD Graphics 3000 and video playing error

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http://askubuntu.com – hello i'm new to linux i'm using Toshiba c850 notebook and i can't install ' intel HD graphics 3000 ' driver on ubuntu 12.04.1 LTS (32 bit) the problem is when i play HD movies , video is not smoothly playing. and every time i boot up my notebook on ubuntu i have to adjust my screen brightness.it goes maximum level every time i restart my notebook.but in windows it works fine and HD videos play smoothly. please help friends. Thanks (HowTos)