Brightness Control Not Working (Catalina)

I'm on a Lenovo G510 laptop with Intel HD-4600 GPU and installed Catalina. Although there is SSDT-PNLF.aml inside E\C\A\P and Lilu.kext/WhateverGreen.kext inside E\C\K\O, there was no brightness control. When I ticked AddPNLF at Clover Configurator brightness control slider appeared, but it doesn't do anything. How can I fix this issue? Thanks