I've run into an issue with screen brightness after installing the Windows 10 Fall Creators Update. In no way shape or form can I adjust the brightness of the display. I have the latest nVidia driver (for the 1070). I have the latest Intel driver from the Dell support section for my machine (intel hd 530).
I've tried rolling back the driver(s). I even reinstalled windows but the issue is still present. My suspicions are with the old version of the intel display driver (from Dell) not working with the latest windows update. When I try the driver from Intel, the message pops up that the latest version of the driver is not certified to work with my machine and forces a cancelation of the install. Is there a workaround to install the latest driver from the intel site?
Some observations: The values mentioned need to be those that work for your model, hence the need for reinstallation. It may instead be in 0001 and/or 0002 (my 17 R3 is showing the value in 0001, pre-correction). It may need to be CurrentControlSet instead of ControlSet001 . Please relay if this solves your issue.
Go to device manager than click on display adapters to see which driver you have ( I had to uninstall my "Intel HD graphics 630") if you have a Intel and a NVIDIA graphics card, start with the Intel driver. look up your driver directly from the provider( if its Intel, install the "Intel driver and support assistant") than uninstall the driver but don't restart your computer ( your display will probably change display scaling and look a bit weird ). Go back to the webpage with your bios and driver installer and scan your computer for updates, than download the update/driver. After it downloads click install ( it may take a few minutes for anything to change ) than restart your computer when it ask you to. This is how I fixed my Alienware 15 r3
I did a update the next day and the same problem came back but this time i had to restart after uninstalling the driver.