I had problems after I installed debian lenny on my laptop, After some digging in the system I found that debian lenny now includes Xorg 7.3 , there's something that made me really lost regarding it, that it simply doesn't use the file /etc/X11/xorg.conf .. actually i didn't find it on my system. So - as I'm used to - issued the configuring command
and I was really surprised that the configurations was only for input devices (keyboard), and the generated xorg.conf was such a lame, contains only the following:
Identifier "Generic Keyboard"
Option "XkbRules" "xorg"
Option "XkbModel" "pc104"
Option "XkbLayout" "us"
Identifier "Configured Mouse"
Identifier "Configured Video Device"
Identifier "Configured Monitor"
Identifier "Default Screen"
Monitor "Configured Monitor"
After digging in this issue I found this thread in debian forums talking about living without xorg.conf and it's a feature in the new Xorg that its configurations is now automated.
After some more digging and searching I found out another thread also in debian forums explaining howto setup the resolution that you need in the new Xorg
anyway I have found a cool tool called grandr , it's a gtk interface for XRandR (X Resize and Rotate). Things are running fine for me now.