Part of starting X involves probing the monitor for information about what resolutions, vertical and horizontal frequencies it supports. As there is no monitor connected I believe a default value is chosen for the resolution and refresh rate. It may be that the monitor being used doesn't support this. I'm not sure this is really a bug though.
-- Graphic controller displays strange colors on Precision 380 when rebooting from Feisty herd 4 https://launchpad.net/bugs/86506 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs