I have ubuntu 12.04 installed on windows 7. When I use the Fn alongside the key to reduce brightness, or even using the system settings, I am not being able to reduce the screen brightness. What is the problem?
I have a SONY VPCEG Vaio and to manipulate brightness in Ubuntu. Based on a article that I lost, I use this:
Here's how i fixed mine :
LCD Brightness Control
Once you have installed the proprietary Nvidia drivers as suggested above, you may notice that your brightness control keys do not work properly. This is fixable by editing one's xorg.conf file. Open a terminal window and type the following:
sudo nano /etc/X11/xorg.conf
This will open your X server configuration (after prompting for your password). You should see a section titled "Device" that looks as follows:
Section "Device" Identifier "Default Device" Driver "nvidia" Option "NoLogo" "True" EndSection
Append a line so it appears like this:
Section "Device" Identifier "Default Device" Driver "nvidia" Option "NoLogo" "True" Option "RegistryDwords" "EnableBrightnessControl=1" EndSection
You will need to restart your graphical server (or reboot) for this change to take effect.
I had the same problem and I solved it as follows.
This page shows how to set up the 3D cube and I am enclosing it because I used the same tool: CompizConfig Settings Manager.
That page tells you what to install and how to do it. Once it's installed, open CompizConfig Settings Manager, go to Accessibility > Opacity. Click on the Brightness and Saturation/*Brightness* tab.
Enable "Increase and Decrease Brightness" and set the key combination for it. Be careful. CompizConfig Settings Manager is a very powerful tool and if you don't know what you are doing, you may damage your Ubuntu system.
I would have posted screenshots but it is prohibited to new users. It is fairly simply though.
I have a SONY Vaio E15 ( E15113 ) and was able to solve the problem using the solution mentioned in an earlier post