The Xorg.conf file is very precise and as soon as you make a mistake, it doesn't work and it no longer loads the GUI until you delete it and report the situation as it was originally. I also had a bit of trouble putting the right syntax, then luckily the MPC user gave me a tip and I did it ... The examples that are reported on Wiki in general are on AMD GPUs, if not answers no one tries to ask Raptor support directly, only they can give you a hand in this sense. Unfortunately, Nvidia GPUs have proprietary drivers and are used very little by the Power community, we use almost all AMD so it is not easy to find information on using NVdia on Power ... Raptor runs the 2070 on Power, see if they know something about the your card ...