I recently got a new laptop running Windows 10. I wiped it, and am in the process of installing Ubuntu 16.04 in my Ubuntu + Windows 8.1 dual boot. The laptop has an Nvidia GTX 960m in it as a dedicated graphics card.
I have installed the latest Nvidia proprietary drivers, the package
nvidia-364, and while it appears as though the screen is at the proper 1920x1080 resolution (as well as in the TTYs reached from pressing ctrl+alt+#), the drivers seem to be having an issue. The refresh rate on the login screen is very low, for the cursor and menus, but for the password field the refresh rate appears decent. When actually go to type my password in, the login starts, then the screen goes black (presumably the session manager crashing, or something along those lines), and after a few seconds I'm again presented with a login screen, as if I hadn't tried to log in at all.
I can provide any information that you need.