Hi macos665, I've tried your two kexts both 32 and 64 bits and i always end in a blue screen and apparently a frozen hack. I have SL 10.6.8 and i've also tried to remove the other AppleIntelGMAX3100 folders from /S/L/E but the only difference was ending with a gray screen instead. My 4500 is a 2a42 rev 07 should i have some other version of the AppleIntelGMAX3100 folders for this to work. Best regards, voidRunner P.S. i'm able to use an older version of AppleIntelGMAX3100FB.kext ( from leopard i think ) which does not depend on the other folder to work. With that one and some DSDT patching along with genericbrightness.kext i also get a fully working brightness slider/keys.