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I noticed that kworker gets very high (75%) when a USB port on my laptop is not used, as soon as I plug something in, it goes down to (0.5%).

Laptop: System76 Lemur (Lemu6)

Ubuntu 15.10 x64

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nope, clean install – IceTimux Dec 22 '15 at 4:09
    
Have you checked dmesg for anything interesting? Maybe check once when it is high and once again after plugging in to compare. – mchid Dec 23 '15 at 0:29
    
nothing seems to change in the dmesg – IceTimux Dec 24 '15 at 22:00
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I have a Lemur with this same issue. Appears to be this bug: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1488426

Using kernel 4.4 (and the two headers packages) from here seems to work for me: http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.4-wily

Update: I found better compatable kernels and updated the link.

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Hey Jay, do you get any weird screen flickers while on the 4.4 kernel? – IceTimux Feb 6 '16 at 23:57
    
Sure (did)! The flicker is a problem with the drm-next kernel. I found out later that the kernels located here work better (and don't have the flicker): kernel.ubuntu.com/~kernel-ppa/mainline/v4.4-wily I forgot to update my solution, so I just updated it with the better link. – Jay LaCroix Feb 8 '16 at 3:55
    
you're a damn live safer man. – IceTimux Feb 8 '16 at 16:10

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