Macbook loud fans after installing Slackware

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http://www.linuxquestions.org – Hi, I finally decided to install Slackware on my Macbook 5.2 ( http://www.everymac.com/systems/appl...dia-specs.html ), in dual boot with Mac OS X, using rEFIT and LILO. However, I find out that when I am running Slackware, the macbook's fans are more and more loud, as I run slapt-get for example. Although I switched to the generic kernel and do not use X, this issue persists. It's like if the memory or the CPU is overused, although the system is not particulary slow. In Mac OS X, I did not have this problem. What should I do? It should be better that I solve this issue before running X. (HowTos)