Comment 73 for bug 1288572

It is now (as of recently) generated by gpu-manager (which is part of ubuntu-drivers-common). Actually quite a few changes have landed to various components related to nvidia prime since you posted the correct results.

I am marking this bug as fix released since I'm fairly confident the gnome-shell issues are resolved. I also believe that gdm will work properly once the case of non-existent display is fixed. If there are further gdm issues after that please follow up that issue on Bug 1262068.

Please file a new bug for the non-existent display issue with xrandr outputs and Xorg logs, hopefully the Ubuntu devs will have more of an idea to figure that out!