I managed to let work AMD Radeon 4350 (512 Mb) on Mountain Lion.
I follow advice of 'Here to help' (from os86 forum) and edited Mountain Lion 10.8.2 ATI4600.kext to add HD4350 support (id = 0x954f).
It worked well, with no need of any other hacks (like modifiy org.chameleon.boot.plist).
Just work out of the box!
I tested it with dual screens config, using DVI and HDMI ports (24" and 17").
Here is the modified Kext (just added 0x954f1002 to info.plist at line 62).
If you have different model ID, I can add to ATI4600.kext, if needed.
martinlbbMember Since 10 Feb 2008
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07 Dec 2008 - 14:41