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[lpuser <1488426@xxxxxxxxxxxxxxxxxx>]

One more thing that it's worth mentioning.
My Dell laptop came with ubuntu 14.04 preinstalled.
I tried to install all the updates (around 600MB of packages), had some issues and decided to download and install the latest LTS image (14.04.3).
What I'm trying to say is that I only noticed this bug after I reinstalled Ubuntu so I'm not sure if it also affected the Dell preinstalled Ubuntu image which might have had some additional proprietary divers included.
At this point I'm unable to reinstall the Dell stock Ubuntu image because I didn't create a recovery disk.

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https://bugs.launchpad.net/bugs/1488426

Title:
  High CPU usage of kworker/ksoftirqd

Status in HWE Next:
  New
Status in linux package in Ubuntu:
  In Progress

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
  work.

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