Linux

I want to be able to make use of my iGPU (AMD Raphael on a Ryzen 7 7800X3D) to render everything, and run my games on my NVIDIA RTX 3080. It's a desktop PC, I have 2 monitors, my main one is plugged to my 3080 and the secondary is plugged to the motherboard, and by doing so, VRR/Gsync works on my main display (the only workaround to get VRR working with a NVIDIA card and multiple monitors). The second thing I would like to do is for Firefox on my second screen to render/decode with my iGPU, so I can watch videos and streams there without sacrificing my frames on my games (losing about 20 frames playing Helldivers 2 if a video is playing on the background because it uses my dGPU to decode).