This is the issue: randomly my PC start to lag and top shows a 100% usage for Xorg. Now, I know that it couldn' be Xorg itself the problem but a call from a client. So I killed everything, one by one, finding that it's unity-control-center's fault even if its window is not open. so i did

killall unity-control-center

and after a while it comes again like magic!

Here's my specs:

Distributor ID: Ubuntu
Description: Ubuntu 16.04.4 LTS
Release: 16.04
Codename: xenial

CPU: Intel Core i7-4790
GPU: GeForce GTX 1060 6GB
RAM: 8GB (7.7 GiB)

Tell me if you need more info. Any help will be appreciated.
Thanks in advance.

  • Any findings here? This happens to me with the surface dock, when using a second screen. Killing it CPU goes to normal. – Tanasis Jul 21 '18 at 13:05
  • nothing for now. :-| – tarzanello666 Jul 22 '18 at 12:57

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