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I recently upgraded to from 8.10 to 9.04 (via a fresh install). When I 
attempted to plug my Compaq nx7400 laptop
into it's dock, I was prompted to "add a virtual monitor" by the display 
utility. After agreeing to this, and logging out and logging back in, my 
primary screen (a 1600x1024 laptop screen) had a line down the middle, and 
everything to the 
left of the line was distorted (lots of horizontal lines/reverse video type 
effects). I tried undocking the laptop (and restarting X), reverting xorg.conf 
(and restarting X), reconfiguring xorg.conf (and restarting X) to no avail. 
Sometimes this effect was present on the login screen, sometimes it wasn't. 
Eventually I realized this problem did not affect
other users on this computer when they had a gnome session running. I tracked 
down a file in ~/.config named
monitors.xml which was causing the problem. Removing this file fixed the 
problem.

To summarize: adding a second monitor made irreversible changes to my setup 
that I couldn't fix using either the gui tools or by changing xorg.conf.
I expected either:
1. The dual monitor system would work or
2. I could use the System->Preferences->Display application to fix or revert 
any changes I had made.
3. Any changes that I couldn't revert in the gui would be revertible in 
xorg.conf

** Affects: xorg (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: monitor monitors.xml xorg
-- 
Second monitor breaks X, stays broken even after removing second monitor
https://bugs.edge.launchpad.net/bugs/371735
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is subscribed to xorg in ubuntu.

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