your monitor could give bogus information about itself. Try running without xorg.conf, ie. move it aside and start X.
** Changed in: xorg (Ubuntu) Sourcepackagename: xorg => xresprobe -- 20" Widescreen TFT not detected https://launchpad.net/bugs/86011 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
