i have tried this suggestion on my compaq armada 1750.acpi doesnt respond on ubuntu. whether i put acpi=off on installation, or whatever there is that was suggested in the forums (combination of acpi=off, apm=off, noacpi, every combiantion) so i tried mandriva limited 2005. however, same problem, then this blog gave me another solution. it worked in a way, however.i have to reboot before the fan has to work. if you have any suggestion regarding this please feel free to email, ryxramos@gmail.com…..