I have a problem with my CPU heat. I'm running Ubuntu 14.04 (64bit) and I have issues with the cooling. I know it might be a hardware issue, but I've checked, the fan is running and in my GUI I use the command "sensors" which shows me a RPM of 2200 and a CPU temperature of 60°C while I'm not running any software. This seems to be really mysterious.

However, if I start my IDE (Eclipse), Firefox and Chromium at the same time, the CPU temp goes up to 75-90° Celsius. I doubt that this is common for a system with 16 GB RAM, an i7 Processor and an Intel water cooling system and I also never had some issues like this before when I was running Ubuntu 12.04 or 13.04.

Fan Speed

At 60°C it's at 1300 RPM, and after start up Eclipse and Firefox it's at approximately 2200 RPM and between 75°C - 90°C depending on how many windows and IDE's I've opened.

If I use the "top" command, there are just few processes like Xorg or Compiz which are taking up to 10% CPU usage at maximum, during the time I'm not running any software.

I have tried to upgrade the Linux kernel, where I failed. After upgrading, I wasn't able to boot anymore so I tried to remove the new kernel from the boot directory and updated my grub file to an old entry, which works fine now, but still with the temperature issue.

My NVIDIA drivers is also up to date, which dropped some issues I had before with the CPU load. So it can't be a problem with the graphic card.

How can I find out, where the problem is, or why my CPU gets that high temperatures, which I only should get while playing games with high end graphics and so on?

Did anyone have some similar issues before?

  • What is CPU model? – Ruslan Gerasimov Jun 13 '14 at 8:48
  • 1
    In reference to cat /proc/cpuinfo/ I have an Intel(R) Core(TM) i7-3820 CPU @ 3.60GHz. To avoid uncertainty I will have to say that I'm using a tower Desktop computer, not a laptop. – Fabian-Terranova Jun 13 '14 at 8:49
  • Then what Cooler is used? Is it enough thermal paste in there? – Ruslan Gerasimov Jun 13 '14 at 8:57
  • It's an Intel BXRTS2011LC, all-in-one Mini CPU Cooler, LGA2011, and as far as I can remember I used all of the thermal paste which was delivered with the cooler. – Fabian-Terranova Jun 13 '14 at 9:06
  • @T-Erra, Could you post the full hw info (on paste.ubuntu.com) sudo lshw -short; sudo lshw -sanitize. – user.dz Jun 13 '14 at 9:16

Well, after updating my BIOS, installing the latest kernel headers and booting a live cd, I've figured out, that the problem was caused by something quite different. I disconnected every peripheral from my computer and booted it only connected to one monitor, instead of the three monitors I've always used. However, I had only an average temperature of 45°C and an average temperature of 55°C after connecting the second monitor. It turned out that after connecting the third monitor, my CPU was blowing up and I've decided now to use only two monitors in the future.

I also noticed that one power cable inside my computer case wasn't connected properly.

Thanks anyway for your help @terdon , Ruslan and Sneetsher.

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