16th October 2016, 12:32
I had a similar issue when I was trying to make the Nvidia card work. The problem was in xorg.conf file that was generated and should not be there. When I installed the Nvidia driver, I had to manually delete the xorg.conf file from /etc/X11 and run sudo prime-select intel from command line. Then it worked and then I used the Nvidia tool to switch the card. But sometimes it doesn't work either. I think the problem is on the Nvidia driver, when I used 364 it was OK.