If you go into your /etc/xorg.conf file you will see the options its using, you probably did this when you installed the nvidia drivers but to recap...
Make sure glx is installed and dri and glcore are removed
Code:
Section "Module"
# Load "GLcore"
Load "glx"
# Load "dri"
EndSection
Now go down to the drivers section for your card and it should look something like this:
Code:
Section "Device"
Identifier "NVIDIA GFX Card"
Driver "nvidia"
Option "RenderAccel" "true"
Option "NoLogo" "true"
EndSection
ALso for xorg be aware that the composite extension disables hardware accelaration for opengl. plus you might get speed increases with these
Code:
Section "Extensions"
# Option "Composite" "Enable"
Option "RENDER" "Enable"
Option "DAMAGE" "Enable"
EndSection
You can have glx with composite if you add "GLXWithComposite" to the device section, but I've found it very unstable.