fan-ny thing

Hi
I use Compaq Pressario laptop. There are few fans in it that seem to be nicely controlled by acpi, except one that is always moving (faster or slower but it never stops). Firstly I though it was due to a temperature conditions but all the temperature points are higher than the actual temperature so it should stop moving. What I discovered is that when I switch off acpi in kernel startup parameters, then this fan really stops and it starts moving only if needed.
Question is, can I anyhow have the same behaviour using acpi?

Regards
Przemek

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