Problem: Laptop freezes on battery

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https://bbs.archlinux.org – Hi since I installed arch to my laptop I have been having problems when I'm using the battery and the wireless (I think). The problem is that the laptop freezes and I can't move the mouse, type or change to any tty, and then the cpu fan goes crazy, at this point I hold the power button to shut down. It don't happens always, sometimes it happens before the GDM is loaded, sometimes when I'm already logged. Lately I noticed that if I close the wireless interface it don't crash instantly when I'm logged and sometimes it don't crash at all.For sometime I have been (HowTos)