The gpu was actually a problem with windows which disabled it in such a wired way that not even the bios could see it any more. The solution (at least for my asus laptop) was this program luckily asus provides tools for linux that let you reenable your gpu. Unfortunately if you enable your gpu after installing garuda your login manager will only show a black screen when you switch to nvidia mode. But just enter your password blindly and KDE Plasma should start normally.
I actually had to reinstall garuda because I made a mistake while messing around with my root partition (DON'T DO THAT) . And after the install the optimus manager was preinstalled and setup as usual and everything worked just fine (except some minor issuse with latte that the display names weren't the same after switching the gpu mode).