I thought it might be nice for other Dell X1 users to see my screen spanning configuration. These xorg.conf files have been working for me in Feisty (7.04) and Gutsy (7.10). These xorg.conf files are a result of using howtos on a bunch of sites, not limited to: Ubuntu Dual Monitors Forum and more explicitly, the Xinerama Howto
My system is:

  • Dell Latitude X1
  • 768MB RAM
  • 80GB internal Drive: 40GB ntfs / 30GB ext3 / 512MB swap
  • Intel 915 built-in graphics chipset
  • Dell 1280×768 widescreen monitor (Built-in on laptop)
  • External Monitor is Samsung SyncMaster 151v 1024×768