What is the problem now? You've contradicted yourself like 10 times in your first post regarding whether Load "glx" works properly...
And you need your Load line to be Load "glx", NOT Load "GLX". Linux is case sensitive.
DVD playback has nothing to do with GL, either, unless your DVD player program uses GL (the way it'd do it is to make one rectangular GL surface, and change the bitmap that it's using to texture that polygon). However, I really doubt that any of them have this as your only option.
Your DVD playback is very likely a 2D-only thing.