edit those sections of your /etc/X11/XF86config this way (look the arrows):
Section "Module"
Load "dbe"
Load "extmod"
Load "fbdevhw"
Load "glx" <-----
Load "record"
Load "freetype"
Load "type1"
#Load "dri" <-----
EndSection
Section "Device"
Identifier "Videocard0"
Driver "nvidia" <-----
VendorName "Videocard vendor"
BoardName "NVIDIA GeForce FX (generic)"
EndSection
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