Brightness control issues after update

after updating nvidia driver even with brightness control enabled in the xorg.conf file I cannot adjust brightness. and using the driver control panel I cannot adjust brightness, hue, or saturation under the Xserver Xvideo correction tab.

The cross-posting was a mistake on my part. I thought the post didn't submit rather than being moved.
I have a 680 gtx mobile card in an system 76 gazp6.
The issues I found were irreverent or were resolved by enabling brightness control in the xorg file
This happen after an update to the driver and the xorg file becoming corrupted.
it was rebuild with nvidia built in tool.
# nvidia-xconfig: X configuration file generated by #nvidia-xconfig
# nvidia-xconfig: version 295.53 ([email protected]) Sat May 12 00:34:20 PDT 2012
Section "ServerLayout"
Identifier "Layout0"
Screen 0 "Screen0" 0 0
InputDevice "Keyboard0" "CoreKeyboard"
InputDevice "Mouse0" "CorePointer"
EndSection
Section "Files"
EndSection
Section "InputDevice"
# generated from default
Identifier "Mouse0"
Driver "mouse"
Option "Protocol" "auto"
Option "Device" "/dev/psaux"
Option "Emulate3Buttons" "no"
Option "ZAxisMapping" "4 5"
EndSection
Section "InputDevice"
# generated from default
Identifier "Keyboard0"
Driver "kbd"
EndSection
Section "Monitor"
Identifier "Monitor0"
VendorName "Unknown"
ModelName "Unknown"
HorizSync 28.0 - 33.0
VertRefresh 43.0 - 72.0
Option "DPMS" "0"
EndSection
Section "Device"
Identifier "Device0"
Driver "nvidia"
VendorName "NVIDIA Corporation"
Option "RegistryDwords" "EnableBrightnessControl=1"
EndSection
Section "Screen"
Identifier "Screen0"
Device "Device0"
Monitor "Monitor0"
DefaultDepth 24
Option "NoLogo" "1"
Option "DamageEvents" "1"
SubSection "Display"
Depth 24
EndSubSection
EndSection

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Attachments:
Battery drains fast.JPG ‏147 KB

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