Comment 26 for bug 441638

> I realized by connecting to the machine via ssh that actually everything is running, ie. GDM, X, Pulse, whatever you just don't get to see anything which is due to a completely out of range resolution of horizontal 268kHz, vertical 281Hz.
> I have now completely emptied /etc/X11/xorg.conf and voila, it works!

Please note that people experiencing this bug have two bugs, first something which causes X to fail, and second an issue with gdm where it keeps trying to restart X and causes flickering. This bug report focuses only on the second issue, the gdm blinking. For the other bug, please file a separate bug report (hint: use 'ubuntu-bug xorg' to do it).

firebird, in your case I would be interested in seeing the xorg.conf before and after your edits in addition to the stuff ubuntu-bug collects, so we can see what exactly needed changed to make it work. However, what you describe sounds similar to many other bug reports we already have so perhaps is just a dupe of a known issue. Hard to say without seeing a complete report.