I don't think this is a mutter problem, as Unity is affected as well and compiz 
is the compositor in that case. I'll file this against the kernel since its a 
hard lockup that seems related to your graphics card, though X may be at fault 
as well since nouveau worsens the crash. Could you please run the following 
command in a terminal (from a session that works):
apport-collect 899511

That will add additional system information and hopefully some
information related to the crash to this report, which the kernel team
will need.

** Package changed: mutter (Ubuntu) => linux (Ubuntu)

** Changed in: linux (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/899511

Title:
  hard crash on ION2 graphics chipsets

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