Create patched AppleBacklight and AppleBacklightInjector:
- unzip the PatchAppleBacklight.zip into a directory.
- make a subdirectory there called 'vanilla'
- copy unpatched AppleBacklight.kext to the 'vanilla' directory
- run the script, ./patch.shInstall the resulting AppleBacklight.kext (or AppleBacklightInjector.kext) using Kext Wizard. Remove ACPIBacklight.kext if you were using that previously. Repair permissions (because my script is lazy), rebuild cache.