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I have a Dell Inspiron 15 L521x (January 2013), and I have just installed Ubuntu 14.04 stock. Everything is kind of ok but it seems that the fans never kick in. So even when editing some stuff on gedit the laptop gets quite hot, nevertheless under MS Windows the fans keep it cold while i type MS Word, I have tried to use i8k but it says:

modprobe: ERROR: could not insert 'i8k': No such device

Some say I should force it, and when I do, I get strange readings from i8kctl, and even when using it to start the fan and set it to high speed, it doesn't seem to work. So I'm about to leave Ubuntu cos my laptop might fry, I have had 2 lock ups cos temperature so far. Any help I'd be much appreciated.

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