Interesting graphs.  It looks like they got it to use much lower
frequencies for that particular load.  What I really wonder about
though, is whether it actually uses less power or not?  According to
Matthew Garret, lowering the cpu frequency does not save power since the
deep C states save a lot more power, and you spend more time in those
when you burn through the work at the higher frequency and get back to
sleep asap.

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https://bugs.launchpad.net/bugs/1188647

Title:
  Please change intel_pstate default to disable

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