ok, your not using bumblebee. it looks like you have optimus manager installed. again, without more info, there isnt much more i can suggest to help you. get yourself on a manjaro live environment, connect networking and
so you can actively provide more info.
alternatively you can try changing the startup mode so that manjaro runs on either intel or nvidia.
You can also specify which GPU you want to be used by default when the system boots :
optimus-manager --set-startup MODE
(replace MODE with either intel or nvidia)
read through the tutorial and linked pages and see if anything you did may of caused this.