T400s Two Monitors Lock Up Computer and Screen Flickers

I am running XP Pro on a T400s using a docking station with two monitors - I find that when both monitors are on extended display the screen often flickers to black and evenually the computer freezes completely - any solution?

I tried the --pos 0x0 and there was no change. I also tried switching the lines of .xinitrc to call xrandr first and no change. I think it has something to do with the way xfce is handling the desktops given the wallpaper switch. I should also mention that this problem does not occur in either awesome or dwm.

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