Nvidia 840M driver installation Acer E5-571

Solution 1:

Okay I have finally found a solution for the problem!

Thanks to these threads:

http://www.bleepingcomputer.com/forums/t/549534/nvidia-drivers-how-to-install-it-in-ubuntu-14041204/
http://www.reddit.com/r/linux_gaming/comments/2gk0dh/problem_with_installing_nvidia_drivers_on_840m/

When the computer has booted up and you see the black screen press ctrl+alt+F1 and log in with your user account.

Edit your xorg.conf with sudo nano /etc/X11/xorg.conf

Find the line that says: Section "Screen"

Insert a new line that says UseDisplayDevice "DFP"

Save with ctrl+o+Enter and exit with ctrl+x

Next install bumblebee with sudo apt-get install bumblebee.

Then reboot sudo reboot