Ubuntu 11.10 won't detect my second monitor

Question

When Ubuntu boots, the second monitor mirrors my other monitor, but when the login screen pops up, the monitor doesn't get any signal from my computer. When I go to monitor setup, it is not detected. If I unplug my first monitor, the second works fin with Ubuntu. When I tried 11.10 on a flash drive, it worked fine as a dual monitor. The default seems to be VGA over the DVI connection. Help?

Solution

If you have an Nvidia card: install your drivers by opening Additional Drivers and installing the recommended option. Then, try checking out the settings in "nvidia-settings". Go into the Display Configuration category and make sure that neither of your monitors are disabled. If so, change them to TwinView.

Comments

[Panther]

you need to provide more information - what video card and which monitor.

[Jorge Castro]

Welcome to Ask Ubuntu! We need more hardware information to help you, can you look at this question and then edit your question adding the information?