Originally Posted by topocho
Thank you Zander.
The fact is that my problem started after updating Xorg and another packages. This is why I use that aproach, but again thank you, I didn't know I must istall the dev package before.
Installing the -dev package helped a lot too... after some thinking, I come to the same conclusion : this was due to Xorg 7.1...
Interesting for debian users : a precompiled for 2.6.16-2 module is out in testing. Works nicely here.
Anyhow, thank you all for your help/interest in the subject