What are the common features of all affected machines?
Are they all using uPD720200 USB 3.0 controller and i915 GPU from Intel?
Are they all using the Optimus engine to switch between two GPUs?

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https://bugs.launchpad.net/bugs/978891

Title:
  ubuntu 12.04 doesn't boot when usb device plugged in (except usb
  mouse)

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