Also see "Updated OpenChrome driver available", http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=814682. It does not appear to be available in Debian Unstable yet.
Fir the VIA and Unknown Card-Ids (3371|1019|2125), Chipset: P4M900/VN896/CN896, and Xserver crash, also see http://bugs.freedesktop.org/show_bug.cgi?id=94130.
