It seems to be not only a ubuntu kernel bug it is a generally bug in the 2.6.20 kernel. I tried the 2.6.20 kernel on my old kubuntu 6.10 and it doesn't work too. Yesterday I build a new 2.6.21 kernel on my system and it works. So I guess the new 2.6.21 kernel will also work on ubuntu 7.04 and asus M2N notebooks.
It seems to be not only a ubuntu kernel bug it is a generally bug in the 2.6.20 kernel. I tried the 2.6.20 kernel on my old kubuntu 6.10 and it doesn't work too. Yesterday I build a new 2.6.21 kernel on my system and it works. So I guess the new 2.6.21 kernel will also work on ubuntu 7.04 and asus M2N notebooks.