I have an HP Pavillion dm4 Laptop I did a fresh install of Fedora 16 on (I think it's an Intel Graphics Device) and Dual Monitors doesn't work. It worked previously, I installed Fedora 13 and upgraded from that to 15.
When I plugged my monitor in the KDE settings shows my video devices, Laptop Display (LVDS1 or something like that), VGA1, and HDMI1. When I go to monitor settings now only the built in display shows up, not VGA or HDMI. Before VGA and HDMI showed up even when not plugged in, for example I never used HDMI on that laptop but I still would see it.
I imagine Fedora 15 and Kernel 3.x would still support dual monitors, so would it be that there is no driver in this version?
I have nomodeset on because if I don't I cannot boot except in runlevels 1 & 3 (Probably 2, never tried)