I'm still ready to try anything you think that can be useful. Marc Brice Goglin a écrit :
You can add: deb http://snapshot.debian.net/archive pool mesa to your /etc/apt/sources.list Then run apt-get update. At this point, apt-cache policy libgl1-mesa-dri will show you a lot of available versions. You can install one with apt-get install libgl1-mesa-dri=6.5.1-0.6 6.5.1-0.6 is the one from Etch. If you can find the first buggy version, that would help us a lot. Don't forget to remove the new line in /etc/apt/sources.list after testing all this. Brice