Weird thing.. I deleted network preferences files (had to reset network interfaces) and fn f5/f6 works now. I did nothing to dsdt since i patched it for this kext.
I have the same problem with my g750jm. After I log in f5 and f6 stops working. Brightness can be adjusted only with shift+f2/f3 (works also before log in)
Tried to boot with only main kexts and doesn't work.
Prob smh with my dsdt. I can't attach it. Says I'm not permitted.