I had a similar problem. turns out it was actual high load that forced
the cpu clock speed to always be more than 3GHz on all (!) cores. namely
the xorg (>100%), systemd-journald (>50%) and rsyslogd(>30%) were
consuming a lot cpu power. in the journal i could see the following line
over and over again:
SynPS/2 Synaptics TouchPad: Read error 9
After a bit of digging I found that the synaptics driver should be
replaced with the xserver-xorg-input-libinput. (which I had already
installed, maybe that was the problem)
see: https://wiki.ubuntuusers.de/Touchpad/
So after removing the package xserver-xorg-input-synaptics the cpu load
went down significantly and so did the cpu-clock and heat.
problem solved for me
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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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