It turns out that indeed my installation was broken and the kbd and mouse drivers from unstable were not properly installed. I have just tried once again and it works very well now. The kdb and mouse driver don't seem to be installed by default with xserver-xorg though.
Thanks a lot for all your help! Lukasz -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org