[all variants] Restore to default for multiple monitors (Xubuntu)

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http://ubuntuforums.org – Hi, I just connected a second monitor to my laptop (Xubuntu 12.10). At first I got the second monitor as a blank screen (only the default background with no panels on it) and I could drag a window from one screen to the other. This was in fact what I wanted. Still I wanted to see what I could do with the display options, so I only checked and unchecked the "Use this output" checkbox for both monitors. I didn't change anything else, well, because there's not much else to change. Now, when both checkboxes for both monitors are checked, my extra monitor displays exactly what is on the (Hardware)