The readme explains how to do this. From
Originally Posted by hurrrtin
starting at line 94:
It is also possible, though very, very alpha and extremely
not recommended for average users to use the asus-switcheroo
module as a dummy switcheroo client that allows you to run
the proprietary nvidia module. To do this, blacklist
nouveau and rebuild your initramfs to get nouveau out of it.
Use the dummy-client=1 option for asus-switcheroo, if loaded
from initramfs, use asus-switcher.dummy-client=1. At boot,
switch to DIS, modprobe nvidia, then start X using the nvidia
proprietary driver. Note that the screen LVDS will go black
as soon as you switch via DIS and will not come back until X
starts. There is no framebuffer driver in this mode, so you
will only have X. This switch is one way, you'll need to
reboot to get Intel graphics back.