Apparently all EFI users are stuck using nouveau https://wiki.archlinux.org/index.php/NVIDIA
See here on how to uninstall the nvidia proprietary driver. These should also help:https://wiki.archlinux.org/index.php/Pa … g_packageshttps://wiki.archlinux.org/index.php/Mi … w_hardware
You might want to look into the chosen keyboard layout [1,2]. Otherwise you can try remapping the scancodes of the keys to the desired keycode/function.