How to adjust the brightness of the screen on notebook displays

Question

I have a slide bar to adjust the brightness of the screen on notebook displays in my application, but I found those articles from internet are adjusting the Gamma value, the behavior is not really like pressing the special key in keyboard. Is there a way to do it? Thanks in advance.

Here is some links what I found.

• http://www.codeproject.com/KB/miscctrl/gamma%5Fmanager.aspx?display=PrintAll
• http://mycomponent.blogspot.com/2009/05/set-screen-brightness-in-c.html
• http://social.msdn.microsoft.com/Forums/en-US/sidebargadfetdevelopment/thread/8fd043fd-79fb-4d91-ad17-0d109f893331

Answer 1

Very unikely that there is a way to do it with software - it's probably controlled by the laptops BIOS, which windows will not have hooks into.

Answer 2

If your app is for Linux you could see how the Screen Brightness applet works by looking at the code.