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Using the display program I cannot detect the second display which is connected with my desktop PC (running ubuntu 11.10 64bit, gtx 280 gpu) via DVI.
Although using a live CD of linux mint the second screen was used when it loaded, without me having to set anything else.

What can I do?

Thank you for your time!

share|improve this question
Are you using Nvidia's binary drivers or Nouveau? If it's the binary driver, then install and run nvidia-settings to configure your display (hit the Detect Displays button on the X Screen configuration and set up TwinView if you like Dual-Head display). And, any reason for running Ubuntu 11.10 now? – gertvdijk Sep 17 '12 at 22:31
@gertvdijk: I am using nvidia's binary drivers. I've set up the separate x screen but it didn't work as expected..After a logout and login,my main monitor became white and the 2nd monitor became main (where the login manager showed up and where unity appeared). Why shouldn't I use 11.10? I am expecting for 12.10, to upgrade..I might upgrade it to 12.04 (i just didn't have the time) – Chris Sep 17 '12 at 22:47
Usually you don't want to use separate X Screens. Try TwinView as I already proposed. Please include more related information like drivers your installed in your question next time. – gertvdijk Sep 17 '12 at 22:57

Because you are using Nvidia's binary driver, try configuring your screen using Nvidia's settings utility (nvidia-settings - both executable name and package name).

For dual screen 'extending screen' configurations set the Configuration to TwinView, like this:

NVIDIA Settings dialog

You may need to re-trigger the detection of just connected displays by hitting the Detect Displays button.

Don't forget to Save to X Configuration File if you like to keep your settings persistent across reboots. You may need to run nvidia-settings with root privileges by prepending the command with sudo or gksu.

share|improve this answer
I did as you said but now the launcher is at the 15" monitor and I want it to be at the 23" monitor. The order of my monitors on my desk is: left 15", right 23". I want to keep that order with the twinview configuration. Is there any way to display the unity launcher at the 23" screen? – Chris Sep 17 '12 at 23:16
Did you try to tick the Make this the primary display for the X screen checkbox for the screen you want to run your launcher on? – gertvdijk Sep 17 '12 at 23:26
Yes, it is checked for the 23" monitor but the unity launcher appears at the 15" one. – Chris Sep 17 '12 at 23:31
@Chris I guess you're hitting a bug somewhere. Try asking a new question, targeted to your (new) issue. – gertvdijk Sep 17 '12 at 23:33
This is what I am seeing now. Posted it just to make sure that I've have the correct settings and not getting the correct result. – Chris Sep 17 '12 at 23:48

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