Way too much assumption and speculations in your post. The bottom line is, the in-game AA option was working in the demo "by changing the ids of ATI graphics cards" which hardly is any driver problem.
Additionally, the in-game AA option was removed when ATI cards are detected.
We were able to confirm this by changing the ids of ATI graphics cards in the Batman demo.
By tricking the application, we were able to get in-game AA option where our performance was significantly enhanced.
This option is not available for the retail game as there is a secure rom.
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