看来我应该放弃AIGLX的努力了
https://help.ubuntu.com/community/CompositeManager/AIGLX
Information about unsupported hardware
The open-source ATI driver (radeon) uses software rendering for alpha (transparency). This makes Compiz unusably slow on a Radeon 9200 (one of the fastest cards supported). No word from ATI on when their proprietary driver (which has proper 3d acceleration) will support AIGLX.
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