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After installing Ubuntu 12.04 my CPU temperature gets abnormally high: 80-86 °C. I saw that the CPU fan isn't running. Is it possible for this problem to be caused by Ubuntu or not?

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I don't think it caused by Ubuntu. Please check

  • Your BIOS setting.
  • Reset it to default.
  • Update your BIOS.

It it does not work then you have problem with your FAN. (I think)!

Please let me know the update.

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Or see here, how to control your CPU fan. – Kaktarua Jul 13 '12 at 18:36

When my laptop g6 does that I took a needle and rotate it manually then I start the computer again and it works again, it happen twice now.

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