I am seeing this problem as well on a Intel 965. Hardy was fine, but the
multiple display support in Intrepid for XFCE and KDE is horrid. Here
are my findings:

1) XFCE:
a) xrandr can re-position screens to above/below, but not absolute
b) xrandr not change the resolution of the external monitor, it is always the 
same as the laptop monitor's resolution

2) KDE:
a) KDE session crashes/exits every time I connect the external monitor
b) KDE session crashes/exits sometimes when I attempt to change the resolution
c) When KDE does not crash, it has the same symptoms as XFCE w/ xrandr

3) Gnome is working fine, correct resolution & positioning

Too bad Gnome is the one I like the least

-- 
[INTREPRID] INTEL 852/855GM or 965GM gives a wrong screen resolution on laptop 
used with an external display
https://bugs.launchpad.net/bugs/272669
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