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I'm currently running Ubuntu 13.10 on my Dell XPS 8700. I've got two monitors hooked up to the computer: one via DVI and the other via DisplayPort. The two-monitor setup works perfectly for the most part, but I've got one annoying problem: when the systems is inactive, only one of the monitors turns off.
Under All Settings ⇒ Brightness & Lock I have it set to turn the screen of when inactive for 5 minutes. The one that turns off is the one connected with DVI. Any ideas?
I stumbled across a solution to this accidentally. Going into "Software & Updates", then the "Additional Drivers" tab and changing the video driver from "X.Org X server" to "NVIDIA binary Xorg driver" (the one that's listed as proprietary and tested) fixed the problem.
