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[Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>]

That confirms that pageflipping is the direct cause of the hangs. Very
recently suspicion has been raised that the gen4 pageflipping irq
handling may be racy - which would help explain why all the reports of
this hang I've seen so far have been gen4.

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https://bugs.launchpad.net/bugs/1116587

Title:
  Lenovo T400: With external monitor the system is rarely working for
  more than 10 minutes

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