Cool'n'Quiet under Linux: Fan won't spin down

Hi,
first off my configuration:
MSI K8T Neo
Athlon 64 3000+ (Newcastle) with packaged AMD fan
Linux 2.6.8-gentoo-r3 (Gentoo)
The powernow-k8 module works for me and I am able to clock the cpu to 1000 MHz. The problem is that the fan won't slow down, or at least not as far as under Windows. Under Windows I usually have around 3000 or less rpm, under Linux it's *at least* 4000 (and I hear the difference). Are there any BIOS settings I need to change so that the fan slows down? Or is it even possible under Linux? The temperature is 32 C right now which is quite low, so the fan should slow down.
Thanks in advance.

guys, how is fan speed regulated? apply a certain voltage depending on the temperature of the CPU. how so? how does it know how hot your cpu can get / how hot it is supposed to get (because it differs alot as far as i know)
i think the ansewr to this question will help the fan speed problem.
Quote
Point 2: Idling at 1000Mhz with C'n'Q enabled in core center the fan speed oscillates between 2860 & 3180 while the CPU temp stays pretty constant at 45C, case temp is 31C.
the temperature sensor (in my case at least) gets rather large jumps when my proc goes from 990mhz to 2.2k. could it just be that the fan speed is changing accordingly? just the act of right clicking system to check properties moves it to 1.75ghz for a second.
edit: one more thing, try running prime95 with fan at 2k rpm and 3k rpm. Perhaps the temps dont change because you have enough airflow w/ both settings to take away the heat from 1000mhz, whereas if it was getting hotter the fan speed would affect temps? (like you said) BUT, in response to "So why on earth is core center trying to drive the fan at top revs when obviously minimum revs idoes just as good a job (and is much quieter!)???" the thing is, the computer doesent test a low rpm and realize that its doing the same job, its just programmed to run w/ certain variables =P ie, set variables. it doesent get to reason it out and feel it is obvious that the same rpms are cooling it to 45c =P
unless its programmed to do that. . .

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