I have an HP 15-D002TX Laptop with both Intel 4000 and Geforce GT 820M graphics. I don't want HD graphics. It can't be done on bios on HP laptops. I did disable it in device manager but after that I can't run any game or gpu intensive things. I tried disabling 820m to check and evrrything ran fine with the performance of igpu. When I enable both as default I get increased performance as compared to Igpu alone. So what to do ? Is igpu required for my laptop 820m dedicated graphics to function ? Thanks.