Actually when I do install my graphics driver my laptop is showing blank screen after windows logo. I have Intel HD Graphics drivers integrated. So I have plan to not to use that driver s/w. So is there any way to adjust brightness without graphics driver?
The brightness should have nothing to do with the video drivers, most (if not all) laptops I've seen have a function button to adjust brightness. If you are getting a blank screen after driver updates you are either using the wrong drivers or there is a hardware issue with the system. Did you try this after a clean Windows setup also?