Assuming this is a nvidia dgpu
Post output of this command
lspci -nnk | grep "nvidia"
Try these in the meantime
1st.If u have optimus manager than switch to nvidia option and try and even if that doesn't work
2. try prime-run ur app name in terminal
If u can't go in nvidia mode then u probably have some problems with drivers
3. According to ur post display should be on descrete GPU Im not sure if I understand exactly what it consequences it should have but does it want whole system to be running of nvidia gpu? I mean optimus-manager leaves intel GPU connected to display and renders stuff on dgpu and then passes it on to the integrated GPU.
4. if nothing works and u have working nvidia drivers then try this on optimus laptop I don't know if it will work on muxless but anyways https://wiki.archlinux.org/title/nvidia-xrun