Ask Ubuntu is a question and answer site for Ubuntu users and developers. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

I want to use 3 displays connected on one Nvidia GeForce GT 44O under Ubuntu 10.04. So there is my configuration:

  • 1 display 1680x1050_60
  • 1 display 1280x1024_60
  • 1 DLP 1920x1080_60 (video projector)

I want to have the two display in TwinView mode (extended desktop) and have the projector on a separate X screen in order to launch XBMC at boot on it. When I try to configure displays as said previously in nvidia-settings, I cannot activate 3 displays at the same time nor use "TwinView" and "Separate X screen" at the same time. Is it possible to do what I want ? If yes could you give me the xorg configuration? Thank you in advance.

share|improve this question

It is possible, although I think you might be asking a little too much of your video card.

Xorg configurations are slightly personal things, in that it's difficult to write one at a distance for someone without having access to their machine or knowing a lot of key details.

The steps involved would be:

  • Backing up your working xorg.conf for reference
  • Using the nvidia-settings tool to generate an xorg.conf for your twinview'd screens
  • Using nvidia-settings again to generate an xorg.conf for your projector
  • Combining both files (with a view to your wokring xorg.conf), giving each it's own server flag and making sure you don't have conflicting name spaces

If everything goes wrong you can always fall back to the defaults using:

 sudo dpkg-reconfigure xserver-xorg -phigh

If you're struggling post where you're at and I (or someone else, I dare-say) will try and help you- but simply writing one from scratch without access to the machine in question is beyond my abilities!

share|improve this answer
Thank you for your answer, please find hereafter my two xorg.conf. (with tweenview) and (separate x screen). I tried joining both file but if I activate tweenview the projector switch of and if I desactivate it I've got the projector but the display in 1280x1024 swith off... – Slayerman Jul 22 '11 at 7:36
Ok- try this: (although I'd be surprised if I got it right first time, so BACKUP! and feel free to return with any errors you can't sort.) – thomas michael wallace Jul 22 '11 at 9:21
I tested your xorg.conf but it's not working : I have my two displays in tweenview mode and the projector is still disabled. Please don't hesitate to ask me if you need more information on my configuration... – Slayerman Jul 22 '11 at 17:15

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.