Also a tm2 laptop user, encountered this problem after installing Debian
Squeeze (kernel 2.6.32-5).  To boot successfully with VT enabled, edit
kernel command line to include:

intel_iommu=on

This is disabled by default because it can crash systems that don't need
it.

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https://bugs.launchpad.net/bugs/742296

Title:
  VT issue: "DMAR : unsupported device scope"

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