By the time Trinity is officially out, Ubuntu 12.04 LTS should be here and hopefully with mature support and perhaps some performance optimizations within the GCC compiler.
I recommend staying away from AMD graphics for at least another 5 years, maybe then the open drivers are mature enough. As for the proprietary drivers, they are a hopeless peace of junk reminiscent of the Windows 95 era, they will never be mature. It's impossible.
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