As Carlos Parra Camago wrote, this bug is present on a Dell  E6410 with an 
intel i7 processor and thus an intel Graphics HD video card.
The bug is present with ubuntu 10.04 but not Kubuntu10.04 (64 and 32 bit)
The bug is also present with ubuntu 10.10 RC daily build from 06-Oct-2010 (64 
bit) running from liveCD.
Thus, is it related to a gnome issue?
As described here: http://www.cs.bham.ac.uk/~axs/laptop/#monitor-problem
The problem can be partially solved by booting into runlevel 3 and launching X 
manually (the tests where performed using fedora distro).
In my case, I solved it temporarily by using Kubuntu (10.04 installed on the 
disk) or Linux Mint Debian Edition (tested from liveCD).

O-p

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[arrandale] X freezes after plugging in external monitor and selecting 
System>Preferences>Monitors
https://bugs.launchpad.net/bugs/599626
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