Comment 16 for bug 203612

@dorkdork, these days xserver can auto-detect monitors, drivers, and resolutions correctly almost every time. But there are still corner cases (maybe including yours), but they're getting so increasingly rare that having a GUI for specifying the monitor is sort of overkill. It's better for us when we find such cases, to just fix the xserver directly, so users don't need to do any configuration at all. If it isn't getting detected properly, please make sure a bug is filed on the issue (see http://wiki.ubuntu.com/X/Debugging).

That said, as Conrad points out, displayconfig-gtk is still present, just not advertised. Unless you're careful and/or lucky, displayconfig-gtk can produce invalid configurations under Hardy, due to the way Xorg has changed, which makes it a lot harder to support and maintain in Hardy than before.

Regarding dual head, displayconfig-gtk is only able to generate valid dual head displays for old Xinerama-based drivers, which are quite rare these days; again, if you are in a corner case where it does work, then by all means keep using displayconfig-gtk for that. But for 99.x% of users, trying to use displayconfig-gtk for this will only break their X. The new Xrandr GUI will eventually support making dual head configs. I don't know if that change will be available for Hardy; if not I will make sure it's available in a PPA, and hopefully get it in for 8.04.1.