Comment 32 for bug 616394

As has been pointed out already, there is someone at Nvidia working on this (or planning to) so it's just a matter of time until this is fixed. In future the Nouveau drivers will hopefully be able to provide decent 3D support for legacy cards which will prevent this situation from being a major problem. At the moment it seems like Nouveau only has 3D support for newer cards according to their feature matrix: http://nouveau.freedesktop.org/wiki/FeatureMatrix