Brightness cannot be adjusted after a video card driver is installed on Ubuntu

I have installed ubuntu10.04 for more than half a month. Everything is fine. I have installed the latest NVIDIA graphics card driver. it is even better to enable special effects !!

However, the problem arises. After the latest driver is installed, the brightness cannot be adjusted up or down based on FN +.
Here is a tip: I learned from the official Ubuntu Chinese Forum: Modify Your Xorg. conf
The location of the Xorg. conf file is under/etc/X11.
Enter:
Sudo gedit/etc/X11/Xorg. conf (case sensitive)
You will be prompted to enter the password.
After the password is entered, a text file, Xorg. conf, is opened.
Take the following content
Section "device"
Identifier "default device"
Driver "NVIDIA"
Option "nologo" "true"
Endsection
Change
Section "device"
Identifier "default device"
Driver "NVIDIA"
Option "nologo" "true"
Option "registrydwords" "enablebrightnesscontrol = 1"
Endsection
That is, add the "option" registrydwords "" enablebrightnesscontrol = 1 "" line. It is best to add it to the specified line !!! Otherwise, it may be invalid.

Save and exit. After restart, you will find that you can adjust the brightness of the screen backlight.

(From: http://blog.csdn.net/k1988/article/details/5884748)