I've read that you had installed nvidia driver.
From your XF86config-4....it looks like your nvidia driver is not running(3d acceleration).
You need to edit one line so that nvidia driver can load and recognized:

# The following line is auto-generated by KNOPPIX mkxf86config
Driver "nv" ***Change to "nvidia"
VendorName "All"
BoardName "All"
# BusID "PCI:1:0:0"
EndSection


Save and reboot.........if you see Nvidia logo........means nvdia driver is running.