I had similar trouble: two monitors + projector connected. Only two can be active at any time, but the projector is detected as on even when I yank the power cord.
I've added this to my /usr/kde/3.5/share/config/kdm/Xsetup
there's a similar file for kde4, probably in /usr/share/..Code:xrandr --output DFP2 --off xrandr --output DFP4 --off xrandr --output DFP3 --primary --mode 1920x1200 --pos 0x0 xrandr --output DFP4 --mode 1600x1200 --right-of DFP3
no idea about the framebuffer consoles.