Samsung laptop won't adjust screen brightness

I have a Samsung Ativ Book 6 NP680Z5E-X02US and recently updated to Windows 10. It uses Intel HD 4000 Graphics and has and AMD Radeon 8770M graphics card. Since updating I am no longer able to adjust screen brightness.

I have tried uninstalling the monitor and restarting. Updating all the graphics drivers. Disabling/Enabling the generic PnP monitor in device manager. Changed all of the power settings. The monitor still stays at what seems to be 100% brightness.

Any other suggestions?

Solution 1:

My system is a ATIV Book 8, model NP880Z5E-X01UB. Also Intel HD 4000 and Radeon 8700M GPUs.

I recently updated W10 to anniversary edition and ran into this issue yet again. I have no idea how I was able to resolve it last time. I attempted to uninstall, and reinstall all drivers from Samsung over again, in various orders, running the Win10 Brightness Control Patch each time provided by Samsung Update, but in each case, never yielded results. I should also note that I've also disabled adaptive brightness in display options and also my power options plan. This was required the first time I got this working so I made sure those settings were changed back after the update reverted them.

After some more intense googling.. I finally found a solution that worked for me.

Modify the following registry key(s):

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class{4d36e968-e325-11ce-bfc1-08002be10318}\0001]

FeatureTestControl

Change f000 to f008

There are other "control sets" other than the CurrentControlSet. I wound up changing them all to f008 prior to a reboot. Though I suspect the CurrentControlSet is all you will need.

Source: https://communities.intel.com/thread/81571

As always, careful when modifying the registry.

Solution 2:

It was fixed for me by windows update, probably this component: Advanced Micro Devices, Inc. - Display - 27.20.1034.6