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I'm using Ubuntu 13.10 on a Lenovo Y510p laptop with Intel Core i7-4700MQ and an Nvidia GeForce GT755M graphics card which I'm not really using thanks to bumblebee (the only graphics driver loaded is Intel).

My problem is that the fan makes an annoying buzz at all times, even though the temperatures of everything are perfectly fine and the load is minimal. It stops, however, shortly after I unplug the laptop from a power source.

My question is: can I determine what changes are made to the system settings when using battery power? Can I apply the same settings when it's plugged in, perhaps just the fan settings?

So far I've tried a few ways to check the state of the fan, but pwmconfig reports no pwm-capable modules and I can't get any other tool to work. Also, I thought that perhaps some battery-saving settings are applied to the processor (limit the number of cores in use?) which cause the fan to spin down, but I have no idea how to determine that.

I would appreciate any help.

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You could try sudo pm-powersave –  psusi Dec 31 '13 at 0:00
    
@psusi I was under the impression that it only affects the hard drive, is that not the case? –  sps Dec 31 '13 at 0:15

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