[ubuntu] noapic makes fans run loud

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http://ubuntuforums.org – Hi all, I have Dell studio 1555 laptop and I managed to make the Fn keys to work. I did it by adding the "noapic" to the "menu.lst" file. Since then I noticed that the fan(s) runs pretty loud. Before that the fans was quiet on some of the times. 1. I want to ask if the mod that I did can harm my laptop? 2. Is this mod will empty my battery faster? 3. Is there a way to activate the Fn keys without changing power management? Hope you have answers for me! (Hardware)