An alternative thing to investigate:  There is another bug particular to
Sandybridge, with roughly similar symptoms to this one, which has
already been git bisected and found a candidate patch.  The flagged
patch with the fix appears to also affect Arrandale, so I have a hunch
it *might* also solve this bug.  But that's just a wild guess.  Please
install and boot this kernel to see if the issue can be reproduced; if
not, then this bug may be a dupe of bug #761065:

http://people.canonical.com/~acelan/bugs/lp753189/

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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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