I have a Lenovo Y510p Laptop with two gt755m graphics cards. I installed Ubuntu updated everything and installed the nvidia drivers. When i want to enable the SLI config in /etc/X11/xorg.conf then the screen just stays black. On startup the Ubuntu Logo shows up and then the screen turns com pletly black. When i boot Ubuntu in recovery mode and empty the xorg.conf file, Ubuntu boots up normally with nvidia drivers, but no SLI.

Does anybody know how to fix that?

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