ACPIBacklight by RehabMan
How to Install:
Install the kext using your favorite kext installer utility, such as Kext Wizard. The Debug directory is for troubleshooting only, in normal “working” installs, you should install the Release version.
Downloads:
Downloads are available on bitbucket:
https://bitbucket.org/RehabMan/os-x-acpi-backlight/downloads/
