On one particular boot with the external power connected, there were
only 1176 interrupts for this event a few minutes after boot.  It was
stable at 1176.  Upon disconnecting external power, it started its rapid
cycling.  Reconnecting the external power source did not solve the
problem.

On another boot when running on battery, the same thing occurred upon
connecting the external power source.

When in such a stable state for the interrupts, behavior matches them
being disabled (which one would likely expect), with load averaging
around 1.15-1.25 (compared to 1.65-1.95 when the interrupts are
constantly firing).

So we probably need a quirk to just ignore this power-state-change GPE
and still need to figure out the rest of the issue.

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https://bugs.launchpad.net/bugs/1489622

Title:
  15.10 20150826 snapshot -- MacBookPro3,1 has high load (and
  temperature) despite low CPU and low IO

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