open source ATI drivers not working

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http://askubuntu.com – Default Ubuntu 10.10 install. system info -> graphics -> driver says "unknown" and experiece : 'standard' Hardware -> additional drivers : totally empty. Windows are moving around sorta slow. lspci | grep VGA 01:05.0 VGA compatible controller: ATI Technologies Inc RS690M [Radeon X1200 Series] What's wrong. Why doesn't additional drivers show propertietary ATI driver? And why is there driver : "unknown" Can somebody help me to troubleshoot this one... (HowTos)