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.)
** Changed in: intel-microcode (Ubuntu)
Status: Incomplete => Confirmed
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https://bugs.launchpad.net/bugs/1480349
Title:
Intel Microcode Breaks frequency scaling in Xeon® E5-2687W v3 &
E5-1650 v3
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