Why not adjustable screen brightness​?

I had lenovo n580a recently with Windows 8 with 64bit preloaded.I got bored with Windows 8 hence downgraded to Windows 7 Home Premium 64bit.
Windows 7 worked very fine after installing the device drivers except for the LCD brightness that doesn't respond to any fine adjustments.
In the main page of Windows Power Managemet  as well as the keyboard hotkeys, the slider either goes to the maximum or minimum brightness (no stages in between though in Windows 8 there were more than 6 stages)
In the advanced settings screen, as far as I adjust brightness (for example to 50% on battery, 70% plugged in) this doesn't lead to any change in the brightness practically.
How to solve this?

Go into the control panel and then to the admin tools and then to services. See if Adaptive Brightness is turned on. Also check in your device manager in the control panel and make sure your device driver for your monitor is correct.
Hoov
Microsoft MVP - Consumer Security
SpywareHammer.com

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