Which graphics driver AMD Radeon 6400M

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http://askubuntu.com – Sorry if this has been answered before but after a lot of searching via Google and phoronix.com . I'm completely overloaded with information and pretty lost. I have a new laptop with an AMD Radeon 6400M card, and have a fresh installation of 12.04 64 bit. After checking the graphics in settings (unknown driver) and trying to install FGLRX via the manager and then later the terminal, I've ended up with the VESA SUMO driver, which isn't optimal. Isn't there an open source driver that is compatible with this card and provides decent 2D &3D acceleration? Or will I be forced to fiddle around (HowTos)