When I first installed a second monitor on Ubuntu Karmic, the dual monitor setup was trivial. The built-in method (System | Preferences | Display) worked very well.
Lately though (possibly due to a package upgrade) that method stopped working perfectly. It couldn't identify the external monitor model (showing it as Unknown), and when I'd select the correct resolution for it (1440x900), on gnome restart or laptop reboot, some icons on the left of the desktop would be all scrunched up together, dragging a window from the external monitor (left) to the laptop monitor (right) would have the window end up partly on the left and partly on the right. It wouldn't go all the way to the right edge of the laptop monitor. As if the virtual screen width had changed to something a *lot* shorter.
I just installed grandr and ran that. It sees better than an Unknown monitor, and the virtual screen width is back to normal. I don't know yet if this fix will survive reboots. But it probably will. And if it doesn't, well, it'll be a reasonable workaround until I upgrade to Lucid.
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