I've recently installed Debian v8.1 and installed Nvidia driver 340.46. In nvidia-settings I am able to enable my second monitor and enable it/set it's position..etc. My second monitor is not being detected in Debian Display and is 'on' but only showing a black screen. I've tried researching and implementing various 'fixes', but I'm not having any luck.

I'm running dual GTX 570's with a monitor plugged into one each (DVI). I noticed in my xorg.conf under Section "Screen" I have an option "MultiGPU" "Off"; would this be part of the issue?

I've tried:
- purging all nvidia drivers and re-installing
- installing different versions of nvidia drivers
- add nomodeset in grub

I'm sure I've tried more, but the above list seems to be the most common suggestions on other help posts. Any suggestions would be much appreciated.

Try to search yourself with the following terms: nvidia dual monitor setup.

http://nvidia.custhelp.com/app/answe...tiple-monitors

I would change from off to on.