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My laptop is hot and the fan is always running. First I ensured the discreet graphics card is disabled (it is), then I checked the system monitor and top:

System Monitor

Top

Looks like a mystery kworker task is hogging nearly all of one cpu. I installed perf and ran the commands sudo perf record -g -a sleep 10 & sudo perf report to get this:

Perf output

Now what? I'm really not sure what any of these processes are. Any tips?

Coleman
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  • Do you have 8 kernels? The kworker process appears 65% busy, yet your system as a whole is only 9% busy. – Jos May 07 '19 at 15:15
  • It's a Quad Core i7-3615QM - maybe each of the 4 CPUs is dual because the System Monitor reports activity for 8 CPUs. – Coleman May 07 '19 at 16:32
  • OK, that part makes sense then. – Jos May 07 '19 at 16:34
  • Hey @coleman! This Q&A on kworker might be of some help? https://askubuntu.com/questions/33640/kworker-what-is-it-and-why-is-it-hogging-so-much-cpu ... maybe that's how you were led to using perf, but there are some steps to keep debugging over on that Q anyway! – Chris Burgess May 08 '19 at 04:31
  • Is there anything repeatedly logged to syslog? – Aidan May 08 '19 at 08:49

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