I got my Thinkpad T420 with Nvidia Optimus T420 4180W1H and without an OS a few days ago. In the BIOS I selected the integrated graphics adapter and then I installed Ubuntu 11.04. It looks like almost every driver got installed automatically. However, I have the problem that the fan runs all the time. Is that always the case?

I updated the BIOS from 1.16 to 1.23 but no change.
I found thinkfan, which seems to be a program to control the fan of Thinkpad Laptops, but iam not able to controle the Fanspeed with it.

Can anyone help ?