Brightness problem fix on

Intel HD Graphics 4000 with NVIDIA® GeForce® GT650M graphics.

Install:

Intel HD Graphics 4000 Driver,     Driver Date: 8/17/2015

Driver Version: 10.18.10.4276

Make sure you backup your registry first before proceeding!!!!

open regedit     Run Command

Registry has wrong value:

Currently reads as :

[HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Class\{4d36e968-e325-11ce-bfc1-08002be10318}\0000] “FeatureTestControl”=

“Edit DWORD 32 bit”=

f000

Registry with New Value:

You needed to change the value in registry to:  (   f008   ) 

[HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Class\{4d36e968-e325-11ce-bfc1-08002be10318}\0000] “FeatureTestControl”=

“Edit DWORD 32 bit”=

f008

Then Restart Computer

Brightness Fixed with Latest driver.