Fans' control not working on iMac G5

[Jabi]

Binary package hint: linux-image-2.6.17-9-powerpc64-smp

I have installed the latest version, Ubuntu 6.10 (edgy eft) beta, on an Apple iMac G5 (first release) 1.8 GHz and even when this version of kernel could control the fans speed that generates quite noise, it looks like this option is not enabled by default.
The fans run at full speed generating a lot of noise. It has to be with thermal control, I think.

[Launchpad Janitor (janitor)]

The 18 month support period for Edgy Eft 6.10 has reached its end of life. As a result, we are closing the linux-source-2.6.17 Edgy Eft kernel task. However, development has already began for the upcoming Intrepid Ibex 8.10 release. It would be helpful if you could test the upcoming release and verify if this is still an issue - http://www.ubuntu.com/testing . If the issue still exists, please update this report by changing the Status of the "linux" task from "Incomplete" to "New". We appreciate your patience and understanding as we make this transition. Thanks!