Ubuntu – connecting 3rd monitor fails with “xrandr: cannot find crtc for output DVI-0”


I've got a laptop with a DVI and VGA output on the back. With everything connected it will only allow me to run 2 of the 3 monitors e.g. laptop display + VGA or DVI+VGA but not all 3. xrandr says I have 2 CRTC's, 0 and 1. The internet says I should be able to share a CRTC if the modeline is the same, and my 2 external monitors are the exact same make and model. How do I convince the software to drive all this hardware?

Best Answer

I think this means your driver can't handle the size resolution you want to stretch across those.