Comment 12 for bug 429369

To make sure that this isn't some artifact of the upgrade process, could you verify that this is also a problem with a LiveCD?

It shouldn't make a difference if you are using xorg-edgers or not, since the monitor detection should happen in the kernel when KMS is used. Could you with an updated Karmic (i.e. 2.6.31-12 kernel) upload Xorg.0.log (again) and the output of `dmesg`, `lspci -vvnn`. I think you may use `apport-collect 429369` to upload these and more, even if Xorg isn't running (you need a launchpad-lib package, but the script will tell you).