This just started happening the other day…
Ubuntu 18.10 - latest patches updates etc…
All of a sudden my cpu fan will spin up and start whining (Dell Latitude E7250 - 4 x Intel® Core™ i7-5600U CPU @ 2.60GHz, 16 GB DDR3 and 500 GB mSATA SSD) and one of my cores will be maxed out :
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
23153 root 20 0 0 0 0 R 80.0 0.0 1:09.92 kworker/0:0+pm
Tried killing them a few times - but parent just spawns replacements …
Also up near the top is “ksoftirqd” proc (with a much lower PID - e.g. 9).
The only “fix” I’ve found - is to reboot, which is a really crap solution from Windows land… PITA… I might see what happens with Kernel 5 when I do-release-upgrade to Disco Dingo over the weekend or early next week… if it persists, I’ll probably go back to Ubuntu 18.04…
Maybe I need to install some sort of CPU “governor”?
Done a heap of google searches - but it always seems to be Ubuntu 16.04 or earlier and/or with NVidia GPU’s (this thing only has integrated Intel GPU).