Okay, well, I'm mildly surprised I don't see this question asked yet, as PP as I like to call it (12.04) boasted support for two monitors.
Why can I not use two monitors? My current set-up is kinda sketchy, so that's probably why. But what part of it is screwed up? Alright. I have an GeForce NVidia 9800 that has two output slots, and I have them hooked up to two computer screens of different resolution. I have it working perfectly in Windows. It also works well in the Ubuntu sign-in screen. However, the problem here lies whenever I sign into my user. I sign in like normal, but the second screen shuts off. When I go to "Displays", it recognizes the screen for me and lets me configure it just like in Windows. HOWEVER, whenever I click apply, it crashes my system and I must restart and it comes back without the new settings.
Yes, I'm using the correct resolutions and I'm not mirroring. I believe I'm also up-to-date on my drivers.
What is wrong here? Is this a known problem I'm unaware of?