With :

Ubuntu Release 12.04 (precise) 64-bit
Kernel Linux 3.2.0-29-generic
Intel® Core™ i7-3635QM CPU @ 2.40GHz × 8

The first CPU is always at ~70%-100% with nothing big running and it is making the fan noisy. I am wondering if it is normal and if not, how can I fix this? enter image description here Thanks.

  • 1
    Click on Processes tab, then View > All Processes, and click on "% CPU", what are the top processes? – taneli May 1 '13 at 18:28
  • 1
    gnome-system-monitor; firefox; at-spi-bus-launcher; etc They all show 0 % CPU. – varnaud May 1 '13 at 18:40
  • Hmm, sorry, there is kworker/0:3 in top of all. It use 72%CPU. – varnaud May 1 '13 at 19:00
  • check what is running using the top command – GM-Script-Writer-62850 May 1 '13 at 19:22
  • Urgh, that is a bit complicated to figure out ... This sister site question has a relevant answer: unix.stackexchange.com/questions/22851/… to figure out the exact culprit, but the short of it is that there's likely a misbehaving driver or hardware. Unless the system is supposed to be doing something heavy. – taneli May 1 '13 at 19:51

I have done the things described in this post : Why does kworker cpu usage get so high? and it worked for me.

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