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RehabMan, thank you so much for your help. Re-patched DSDT/SSDT, DropOem True, and the magic slider of brightness is working !! Once again thank you for your effort and time to help others. :headbang:

Hi RehabMan, I've just installed fresh Sierra (10.12.4) and have the graphic working (ig-platform-id : 16160000 with 1024 MB), but can't control brightness (no bar in display pref). I've followed your instructions for this 10.12.4 brightness control, including inject EDID with the Ruby script...