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You can overload your CPU, and hence generate heat, by using cpuburn: CPU stress tester for Ubuntu Linux - http://www.hecticgeek.com/2012/03/cpuburn-cpu-stress-test-ubuntu-linux/ However if you are wary of running external programs then you can try CPU hammer shell script which uses awk to generate load by doing mathematical calculations ...


Select System Settings Click on Sound Click the Input tab and you should see Internal Microphone


By asking this question I assume you do not care about battery backup much. Having said that, CPU Frequency scaling is what you are looking for. Dynamic Frequency Scaling is a technique by which the frequency of a microprocessor can be automatically adjusted "on the fly," either to conserve power or to reduce the amount of heat generated by the chip. More ...

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