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Fan spinning forever


I'm using on debian testing and I'm having issues with the cpu fan. First of all on boot I run a script which contains:

echo 30 > /proc/acpi/thermal_zone/THRM/polling_frequency

otherwise no polling interval is set. When the acpi modules are loaded, the fan stops which shouldn't be a problem after a boot because the processor isn't that hot. The problem is that the fan doesn't start even if the processor heats up, although if I run "cat /proc/acpi/thermal_zone/THRM/state" I get that the fan is activated but it's not. Actually I can prevent the overheating of the processor by doing this:

echo 3 > /proc/acpi/fan/FAN0/state
echo 0 > /proc/acpi/fan/FAN0/state

and the fan starts spinning but then it never stops. Any suggestions welcome on how can I make the fan work properly.

P.S . How could I make human readable the acpidump output, maybe I can get some information from that.

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