I have not tried this in recent Ubuntu yet, but I can tell you that
pstate seems to work very well in Debian's 3.10 kernel on my Ivy Bridge
laptop. The problem thus might not be caused by intel_pstate itself but
by a combination with some other option(s) and/or patch. It seems to
increase the frequency much faster than the ondemand governor; but this
does not seem to be bad; in any case, my fan is off most of the time.

Maybe this helps you. I can check it on Ubuntu too, but I just wanted to
let you know my experience on Debian first.

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

Title:
  Please change intel_pstate default to disable

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