I am struggling with this. I have tried multiple things that I have found on the net with no luck. I have built in Intel graphics on my motherboard. I have DVI/VGA/HDMI ports on my motherboard. I have configured BIOS to allow both of them to work. I have had this working just fine on Windows 7 & Windows 10 here at work. I have decided that I want to get away from Windows on my desktop PC here at work and switch over to linux. For anything needed with Windows, I would have a VM for that.
Anyway, I have a Nvidia graphics card and for the life of me, I am unable to get this working. If you use the factory generic driver, and go to the display settings, you see all 3 monitors, but only the 2 on the Nvidia card will actually work. It is very jumpy, mouse pointer hides when moving...etc. If you install any of the open source Nvidia drivers then it gets rid of the jumpiness and the mouse pointer from hiding. If you go to the display properties in the nvidia panel application then it doesn't see the monitor after you pick the nvidia driver....nor does it in the normal display properties in ubuntu.
I have a mini hdmi out port on my graphics card with the 2 dvi's....I figured I would be smart and run all 3 monitors off of one card...no, that doesn't work either....it shows the monitor but it will not enable it in the nvidia app....
This is so frustrating.