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I have Dell N5010 laptop with Intel's i5 processor (1st generation), 4 GB of RAM. I have been using Ubuntu for a quite long time ,since the versions 10.04 and later versions. My Laptop was getting super-heated and shutting down automatically after the temperature rose to some threshold level. On the other hand, it didn't heat that much in windows.

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I had cleaned up my sink-fans,kept laptop at some elevation from table/bed surface. Improved Airflow. But, nothing worked for me. This Jupiter tool worked for me. I am using it in power-saving mode and no performance degradation issues. I can carry out my normal functionality. Here is the link :-

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This worked for me on Dell inspiron 3521 - Ubuntu 13.04 . Less sound of fan (Using tlp as well -

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