edit your /etc/X11/xf86config-4 like this:
Section "Device"
Identifier "Card0"
# The following line is auto-generated by KNOPPIX mkxf86config
Driver "savage"
VendorName "All"
BoardName "All"
# BusID "PCI:1:0:0"
EndSection

then restart knoppix.It should be able to automatically detect the driver and display correctly.