hi, again me for another problem
cat /proc/nv/card0 tells me that my system supports the SBA but it can’t be enabled.
i modified the os-registry.c file for NVidia kernel, but it’s not enabled.
there are no problem for fast write anyway.
It seems that using NVidia glx extension is only a bennefit when you have these enabled:
AGP, SBA and FW.