[xubuntu] xorg.conf doesn't work in 11.10

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http://ubuntuforums.org – I have a xorg.conf that works in Ubuntu 9.10. The xorg.conf adds a new modeline and setup dual monitors. Recently, I tried Xubuntu 11.10, and sadly found that the same xorg.conf doesn't work anymore. To be more precisely, I did see the wallpaper showed in the correct resolution in the beginning, but then my first monitor, Dell 2007FP, turned black. I checked with xrandr -q, and found that the new modeline doesn't exist. I also tested the same xorg.conf in debian 6.03, no problem at all. My guest is that the new Xubuntu adds some kind of screen auto detection, and this cleasr the setting in x (Hardware)