Intel Power Management shows flat curve (iGPU)

Hello everyone!

I am using Opencore 0.5.8. My configuration is as given below. I don't know if my iGPU is working or not. Intel Power Management shows flat curve for GFX. I am on Catalina 10.15.4. Using latest WEG, Lilu and AppleALC.

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Intel i5 9600K

Samsung NVME 970 plus 500 GB

Gigabyte Aorus Elite Z390

GSkill 3200 MHZ, 32 GB

Corsair VS 550

RX 590 Nitro+ 8GB

22 inches dual Dell monitors

Intel Power Management