[ubuntu] My video Card is not working at its best

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http://ubuntuforums.org – I am using Ubuntu on hp pavillion g6 laptop but my video card intel HD graphics family is set always to standard and not performs best. When I minimize any application windows in my Ubuntu 12.04 the outline of the window remains on the screen and even it does not give me option to resize the doc at the left hand side. Please help me out I have installed mesa-utils and updated the system Even did the grub settings with nomodeset but do not know the grub settings Intel HD graphics Family (Sandybridge). (Hardware)