This program sets the screen brightness of the Lenovo U150 laptop. I have not tried it in other systems, and it will surely not work because it uses hardcoded PCI references.

Compile this C++ program with

g++ -o brightness brightness.cc

Move it to /usr/local/bin/, set the SUID permission and then add keyboard shortcuts for the command in your desktop environment:

brightness up
brightness down

More info on Linux on Lenovo U150 at

http://facorreadtech.blogspot.com/2010/03/gentoo-linux-on-lenovo-u150.html

Also, thanks to David Kelso for his excelent fix and guide, which you can also apply to this program.

http://github.com/zaius/bright

I do not have any relationship with Lenovo or its trademarks.