Lxrandr

Monitor configuration tool

LXRandR is the standard screen manager of LXDE. It manages screen resolution and external monitors. You can plug in another screen into LXDE or choose to use a big screen projector. Local screen and extenal screen can be used at the same time. LXRandR configures the screen solution automatically.

WWW http//wiki.lxde.org/en/LXRandR