@Doug Smythies: thanks for the reply.
I'm sampling every second.

Anyway, just to better understand.
When my system is idle all cores spend in C0 less than 10% of the time and the 
frequency of each core reported by i7z is different and below 2.2GHz. When I 
run a single core (and single thread) task, there is just core "0" which is 
100% of the time in C0 state (as it should) but I would have expected only such 
core to reach ~2.9GHz and the other to remain in below. Instead all cores goes 
to ~2.9GHz.
https://www.youtube.com/watch?v=HBKfkiOgIv4 (sorry for the oversimplified 
reference)

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https://bugs.launchpad.net/bugs/1768976

Title:
  Ubuntu 18.04 is overheating after upgrade from 16.04

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