Since gdm tries to start Xserver serveral times, some of them in failure mode, the Xorg.0.log files get overwritten too. To get the right Xorg.0.log with the error, just try to run a simple "X" as root.
Since gdm tries to start Xserver serveral times, some of them in failure mode, the Xorg.0.log files get overwritten too. To get the right Xorg.0.log with the error, just try to run a simple "X" as root.