Lenny upgrade: Is there a way to reconfigure video card in lenny?

[S D <sundimi@yahoo.com>]

I'm trying to resolve "Desktop is not using full screen" problem that appeared after upgrade from etch to lenny. More info about the issue can be found at:
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=515840

http://groups.google.com/group/linux.debian.user/browse_thread/thread/b651d56d24d02d35#

Since there's no solution so far, I'd like to try to COMPLETELY reconfigure my video card settings. Is there a way to do it in lenny?

I tried "dpkg-recofigure xserver-xorg" but the reconfig process asked some questions about the keyboard it didn't ask anything at all about the videocard.

Thanks