It works now pretty well (enought for the 3D features I needed). I still have some times problems to switch from X to console (screen stays black, but Ctrl+Alt+F7 give it back), but I'm satisfied with the result :). Have to test on a fresh install and document it.
I found on this page : http:// ubuntuforums. org/showthread. php?t=843052 that I had to remove libglitz1 to get dri activated.
It works now pretty well (enought for the 3D features I needed). I still have some times problems to switch from X to console (screen stays black, but Ctrl+Alt+F7 give it back), but I'm satisfied with the result :). Have to test on a fresh install and document it.