How to set the CPU temp where the fan kicks in?

[Chris Jones]

> One thing I'd like to change though is the temperature at which the CPU 
> fan kicks in. It's seems to be set to 40 C by default. I'd like to bump 
> it up to 50 C.
> 
> Any ideas on how to accomplish that?

I used to do exactly this on a dell using gkrellm and a dell specific 
plugin (i8kutils I think). Maybe there is something similar for Lenovo 
machines ?

Chris