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[Derek White <question76718@xxxxxxxxxxxxxxxxxxxxx>]

Question #76718 on xorg in ubuntu changed:
https://answers.launchpad.net/ubuntu/+source/xorg/+question/76718

    Status: Open => Answered

Derek White proposed the following answer:
That really seems a mess. You have 3 device sections! Screen 1 is right
of screen 0, but it start at pixel 0 0? Does your Xorg.0.log freak out
when it parses your xorg.conf? :)

I would backup the xorg.conf to xorg.conf-backup. Then blank it out
(delete all the text and then save it), or better yet run the
reconfigure command listed in the comments) and then reconfigure it with
nvidia-xconfig (be sure to add in your busid before rebooting/restarting
X - can be found by running the lspci command at a terminal).

A decent guide using the 180 drivers can be found here:
http://vladgh.com/2009/04/how-to-get-dual-monitors-in-ubuntu-with-
nvidia/#high_1

It really should just work with xinerama after using nvidia-xconfig and
nvidia-settings. I suspect your excess edits to the xorg.conf file are
the culprit. The more changes you make, the more problems can arise.
Only save once (when you are done) in nvidia-settings. And reboot
immediately.

If problems occur, use recovery console to restore the backed up
xorg.conf file.

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