I'm a newbie but i patched my DSDT and it works perfectly for me.
I run Mavericks 10.9.0 on my Acer V5-571g
mainboard intel h77 Ivy Bridge CPU i5 3317U and HD4k.
I removed all other graphic kext Nvidia, GeForce and Ati.
Now this DSDT add the brightness bar in System preferences.