downgrading xorg

[Ivan Glushkov <glushkov@mail.desy.de>]

Hi,

I am trying to downgrade my Xorg version, since I need that for 
installing the ATI drivers (fglrx). The problem is that they need 
version < 6.8.9, and I have currently 6.9.0. I tried to change my 
sources.list to point to testing, and I was thinking that simple
apt-get update
apt-get upgrade xserver-xorg libglu1-xorg-dev libglu1-xorg
should do the work, but it does not.

Thanks in advance,
Ivan