COOL-BITS--
This is accomplished by setting COOL-BITS=28, which allows setting clock speeds and fan speeds. That is the short of it. Somewhere back in this thread there is more detailed information, and the Cool-Bits2 Scrypt. The scrypt (a BASH scrypt) allows for command line regulation of fans. If you do a search on Cool-Bits, and Cool-Bits2 scrypt, you should find it
It is also possible to regulate fans from the Desktop GUI if Cool-Bits=28 is set. I would have to find the stuff (again), but it is searchable. I have the scrypt printed out in a binder. If you can't find it on your own, I'll dig it out for you. --scryptr