The problem does also occur if I plug-in the external monitor _after_ the laptop has booted. If I then go to the Gnome "Display Preferences" and click "Detect Monitors" my X server freezes as described before.
The problem does also occur if I plug-in the external monitor _after_ the laptop has booted. If I then go to the Gnome "Display Preferences" and click "Detect Monitors" my X server freezes as described before.