Why does the display brightness adjustment not work after replacing the laptop matrix?

Question

laptops

Good day.
There is a Lenovo Y570, on which the screen was broken (matrix AU Optronics B156WX02 V2).
I bought an analogue LG LP156WH4.
Connected, the screen works, but the brightness now works in two modes: minimum and maximum.
Windows 7 x64 system.
I changed firewood for Intel HD3000, reinstalled Lenovo Energy Management, tried to configure it through Power Options in the Control Panel. Threw live cd Ubuntu - all the same.

Answer 1

if you really need, then you can alter the matrix.
what you need:
1 programmer
2 direct hands
or try to do it using software methods, through the video card settings.