You do not appear to be using the NVIDIA X driver. Please edit your X configuration file (just run `nvidia-xconfig` as root), and restart the X server.
sudo nvidia-xconfig
Using X configuration file: "/etc/X11/xorg.conf".Backed up file '/etc/X11/xorg.conf' as '/etc/X11/xorg.conf.backup'New X configuration file written to '/etc/X11/xorg.conf'
# nvidia-xconfig: X configuration file generated by nvidia-xconfig# nvidia-xconfig: version 310.19 (buildmeister@swio-display-x86-rhel47-08.nvidia.com) Thu Nov 8 02:09:12 PST 2012Section "ServerLayout" Identifier "Layout0" Screen 0 "Screen0" 0 0 InputDevice "Keyboard0" "CoreKeyboard" InputDevice "Mouse0" "CorePointer"EndSectionSection "Files"EndSectionSection "InputDevice" # generated from default Identifier "Mouse0" Driver "mouse" Option "Protocol" "auto" Option "Device" "/dev/psaux" Option "Emulate3Buttons" "no" Option "ZAxisMapping" "4 5"EndSectionSection "InputDevice" # generated from default Identifier "Keyboard0" Driver "kbd"EndSectionSection "Monitor" Identifier "Monitor0" VendorName "Unknown" ModelName "Unknown" HorizSync 28.0 - 33.0 VertRefresh 43.0 - 72.0 Option "DPMS"EndSectionSection "Device" Identifier "Device0" Driver "nvidia" VendorName "NVIDIA Corporation"EndSectionSection "Screen" Identifier "Screen0" Device "Device0" Monitor "Monitor0" DefaultDepth 24 SubSection "Display" Depth 24 EndSubSectionEndSection