IntelBacklight 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.
The typical “Backlight Fix” patch or AddPNLF_1000000 in Clover will do the trick. The more complex patches “Brightness Fix (Haswell/Broadwell)” or “Brightness Fix (HD3000/HD4000)” are not necessary, although this kext will work with them.
Downloads are available on bitbucket: