I have recently dual-booted my PC with Windows 7 and Ubuntu 13.04. I also recently upgraded to 13.10. The problem didn't change, so that is irrelevant except to the fix I suppose. While looking around, I found Psensor and decided to check my stats.I have linked to a screenshot displaying the results, since I can't post a picture. http://imgur.com/yGBKctZ You can see that the fan speed has a minimum of over 850 rpm. It is my understanding that Psensor displays the minimum and maximum values that have occurred since the program was opened. Herein lies the problem. The fan does not stop or slow down. Ever. Let me know if you need any more info or if I need to run any tests that would help. I'm willing to try whatever.