FYI still happening to me on 18.04 with HWE kernel,
similar behavior as #38: kworker with steady high
cpu usage after un-docking, re-docking didn't solve
it tho.

kernel: 4.18.0-15-generic
hardware: Thinkpad x270, Thinkpad Ultra Dock, network: enp0s31f6 (dock eth) and 
wlp3s0 up

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  High CPU usage of kworker/ksoftirqd

Status in HWE Next:
Status in linux package in Ubuntu:

Bug description:
  kworker consuming 71.5% cpu resource
  ksoftirqd consuming 28.9% cpu resource

  It leads to power consumption issue and sometimes leads to BT does not

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