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Did you ever find a way to fix this? I have a g570, too, QE/CI working, et cetera; however, my Intel i3-2310m is one I bought on eBay and put into the machine, replacing the Pentium B940 it originally had. I'm running 10.7.4 -- same brightness issues as you. It works, but lowest usable step above black screen is too bright. Running F.lux helps at night, though. My DSDT is here: https://www.dropbox.com/sh/eo9zuoqnkirz5y3/2UDIyKCCVM