I have a desktop machine (Dell T5600) with an Nvidia graphics card (Quadro 2000), and two monitors (Dell 24"), and I'm running xubuntu 14.04. If I switch off a monitor connected with DisplayPort, xubuntu detects the monitor being removed, and rearranges my desktop. On switching it back on, I have to reconfigure my desktop setup (extented desktop on two monitors). If I switch off a monitor connected to DVI, this does not happen, and when I switch it back on, everything is at it was.
How can I make xubuntu ignore the monitor being turned off, and keep everything the way it was when I turn it back on?