Comment 27 for bug 1480349

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Philipp Kern (pkern) wrote : Re: Intel Microcode Breaks frequency scaling in Xeon® E5-2687W v3 & E5-1650 v3

So for E5-1650 v3 specifically:

0x2b works (microcode in trusty). 0x36 works with 3.13, but not with either 3.19 nor 4.3. (Pointing at intel_pstate, I think.)