Brightness not working after installing NVIDIA driver

Question

I recently installed Ubuntu 11.10 on my Mac Book Pro 7,1. I installed the NVIDIA driver (285). The brightness keys are working (F1 and F2) and I get the box showing the brightness but it does nothing. I can change the brightness in the NVIDIA X Server Settings application. How can I get the brightness working without uninstalling the driver? Thanks in advance.

Answer 1

I had a similar issue with my laptop, there is an option you need to add to your /etc/X11/xorg.conf

Make sure in Section "Device" you have the line

  `Option "RegistryDwords" "EnableBrightnessControl=1"`    

Answer 2

You need to enable Brightness Control. Open terminal and type sudo gedit /etc/x11/xorg.conf And then add Option "RegistryDwords" "EnableBrightnessControl=1" inside the ** device section**, make it new line. Then restart your computer and everything should be fine.

Answer 3

There are some computers, such as my Lenovo W520, that don't with the Option "RegistryDwords" "EnableBrightnessControl=1" line. If you are one of those unlucky ones, you can try the nvidiabl driver (link here).

The nvidiabl driver provides a proper way to change the screen brightness. On some laptops the Option "RegistryDwords" "EnableBrightnessControl=1" hack will cause the backlight controller or your GPU to emit a high pitched noise.

Just download and install the latest Deb file from here: https://github.com/downloads/guillaumezin/nvidiabl/nvidiabl-dkms_0.72_all.deb

and run:

echo "nvidiabl" | sudo tee -a /etc/modules

to ensure that the module will be loaded when the computer boots.

Answer 4

Thanks I have Sony Vaio and its OK when I Tried as shown in Chen Xiao-Long message *Just download and install the latest Deb file from here: https://github.com/downloads/guillaumezin/nvidiabl/nvidiabl-dkms_0.72_all.deb and run: echo "nvidiabl" | sudo tee -a /etc/modules*