Geting this on a 2011 Dell Lattitude, Ubuntu 11.10, always and only when
the power cord has been unplugged and then plugged back in again.
Once it's started happening, I can turn the kworkers on by plugging the
cord in, and turn the big off by unplugging the cord.  I've tried with
several recent kernels including the realtime ones, and the same
behaviour results.

uname -a
Linux charles-nst 3.0.12-rt30 #1 SMP PREEMPT RT Wed Dec 14 09:57:01 GMT 2011 
x86_64 x86_64 x86_64 GNU/Linux

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https://bugs.launchpad.net/bugs/887793

Title:
  Kworker constantly taking about 100% CPU

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