It happens the same to me with a 7440 under all distributions i tried. Till i tried Suse 10, in the first boot the fan magically dropped its revolutions slowly till it stopped. I tought: great! Then i went to sleep and the next day when i booted on Suse it was again at full revolutions and no matter what i tried it wouldnt ok. i have all powersave modules loaded and the FN1 reports fan should be off, but it obviously isnt.
Since then ive tried reinstalling Suse from scratch several times but it wont work again, a complete mistery to me. Im kind of novice when it comes to linux but that the same machine comes out of an identicall installation procedure in a different state seems quite strange to me.