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One of the things that has annoyed me with Nvidia’s Twinview utility is that it doesn’t recognize if you swap external monitors (or at least I couldn’t figure out how to make it do this).  I use an external monitor at work and at home, but they are different resolutions.  Typically what I do is put my laptop to sleep at home/work and then fire it up again when I get to work/home.  This works fine except my external display resolution is wonky because each monitor uses a different max resolution.  Enter disper. Disper allows me to adjust my display on the fly, even if I swap external displays. Here is what I do to get the new monitor recognized. First, turn off the external display which shrinks my desktop back to my laptop screen:

disper -s

Then I extend the display back to the new display:

disper -e -r auto -t left

This is also great for using an overhead projector. Another great thing about disper is that is command-line only. Much faster/easier than the crappy Twinview GUI.

Disper can be obtained here. Fedora RPM courtesy of the Yellow Cow Blog.