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[Misaki <1744515@xxxxxxxxxxxxxxxxxx>]

Problem does not happen when booting from linux kernel 4.8.0-34-generic;
CPU usage is slightly higher than Metacity, no significant kworker
threads.

It does happen with updated kernel 4.13.0-25-generic (previously -21).
When I went to recovery mode for 4.13.0-25, tried to select failsafeX
graphics, then resumed normal boot, resolution was messed up and Compiz
and Xorg were at 50~60% of a CPU instead of 5~8%. Unfortunately, did not
note whether there was a high kworker thread.

Hope this helps. I don't have any other kernels installed.

Could someone please at least try to verify this? If they don't
experience it, that's useful to know as well.

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https://bugs.launchpad.net/bugs/1744515

Title:
  Compiz flashback has high-CPU kworker thread when screen updates

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