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I have an nVidia GeForce GT 730 & am using the nVidia proprietary driver (361.42) on Ubuntu 16.04. I have 2 monitors & a projector. The first monitor maxes out at 1280x1024. The second monitor & the projector are both capable of 1920x1080 max resolution.

I want to have the 1st monitor set as the primary with the 2nd monitor & the projector mirrored at 1920x1080. I have tried the solution here (How can I mirror one of the screens in a 3-monitor setup?) but it doesn't work. I get the 1st screen working, but the 2nd & projector both go blank.

I have also tried a splitter cable, but then I cannot set the resolution to anything sane; the settings max out way below 1920x1080 & the Display window cannot properly detect the display(s) but shows "Unknown display".

It is possible to get the setup I am after?

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I was unable to solve this via software but I did find hardware that made everything work as desired. I purchased a video splitter box (this one for reference - https://www.amazon.com/gp/product/B01CZAJUCG) & it has solved my problem. Apparently a splitter cable just confuses the computer as to which display identification to believe where a video splitter box only sends one display's EDID to the graphics card. And provided you select a resolution that is supported by both displays, everything should work.

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