I installed the kernel posted by Timo, and so far I am pretty happy with it. 
Let me test it for a few days, though: on my machine (thinkpad t410) these 
crashes are a bit erratic.
This is what I tested so far:

Booted docked -> correctly shows both LVDS and external monitor
undocked -> correctly updates monitors to display only LVDS
re-docked -> updates and shows both LVDS and external monitor
suspended docked, undocked, resumed -> black screen. fixed by switching to 
console and back
suspended undocked, docked, resumed -> shows both LVDS and external monitor 
correctly.

I'll let you know if the fix is really stable. 
Thanks for the effort fixing this annoying bug.

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https://bugs.launchpad.net/bugs/745112

Title:
  [arrandale] desktop is messed up (goes black) when laptop is docked
  with two external 1920x1200 monitors (x86_64)

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