Finally I ended up upgrading to Lenny and with the new version of X.Org I have no problem.
Nevertheless, I've been reading the Debian FAQ and It says that Unstable is recommended over Testing (Lenny) for a variety of reasons... so I'm now thinking on an upgrading to Sid (still thinking). Is the upgrading to Sid process similar to Lenny upgrading? I mean, if I change the entries in my sources.list from lenny to sid and testing to unstable, then applying "apt-get update && apt-get dist-upgrade" I finally ended up in Sid distribution or is it necessary something more?
