Not all NV1x cards have AIGLX/GLX_EXT_texture_from_pixmap support in the binary drivers (If you have a Geforce 256 you have to use the legacy-legacy 71xx drivers). I believe that there were a lot of requests for AIGLX support on GeForce 2MX era cards and eventually an NVIDIA engineer looked at how much work it would be to backport the changes the from later drivers and felt it was doable. If the cards are still being sold and there's a business reason to support them...
Not all NV1x cards have
Not all NV1x cards have AIGLX/GLX_EXT_texture_from_pixmap support in the binary drivers (If you have a Geforce 256 you have to use the legacy-legacy 71xx drivers). I believe that there were a lot of requests for AIGLX support on GeForce 2MX era cards and eventually an NVIDIA engineer looked at how much work it would be to backport the changes the from later drivers and felt it was doable. If the cards are still being sold and there's a business reason to support them...