This smells a bit like a bug in the kernel, an X-driver bug shouldn't be able 
to freeze the system completely. There are a few tests you can do to find out 
this, and we would be interested in the result of all of them.
- When the system freezes, does CapsLock still turn on and off the keyboard 
LED? (if it does, it is probably not a kernel bug)
- If you have another computer and network available: Could you install 
openssh-server and see if it is possible to log in after the freeze? (if you 
can't it's likely a kernel bug)
- Try and do a Ctrl+Alt+F1 before you plug in the external monitor. Does the 
system freeze and dump debugging information to the screen? If it does, it is a 
kernel bug, and that text on the screen is key information for fixing it. Since 
the system is frozen, you will either have to take a photo or write it down 
manually.
- Next time you start the computer after a freeze, is there any information in 
/var/log/kern.log or /var/log/kern.log.0 from the time the computer froze?

-- 
[iGM45] Connecting external monitor causes system to lock up.
https://bugs.launchpad.net/bugs/319717
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