You need to supply more info about your graphics hardware. It depends on the make/model as to what drivers are available. AMD (ATI) or NVIDIA chipsets are often supported by proprietary drivers for best performance. Intel, and others are not so good for graphically intensive use (games and multimedia applications).
Open a console (terminal window) and type this command
In particular, you're looking for a line pertaining to your graphics controller like this for example
Quote:
01:00.0 VGA compatible controller: ATI Technologies Inc M22 [Mobility Radeon X300]
Kernel driver in use: fglrx_pci
Kernel modules: fglrx, radeonfb
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Post details here.