Can't controll HP 15-r012tx LED brightness

Controll unavailable on HP 15-r012tx windows 8.1 64bit NVIDIA geforce 820M
No in charm, no in nvidia controll panel. Using latest nvidia driver. All driver correctly install and working.
Can't control brighness using keyboard function also.
Windows license is genuine.
Any experience?

HI @ardmatrik ,
Welcome to the HP Forums!
It is a great  place to find answers and suggestions!
For you to have the best experience in the HP forum I would like to direct your attention to the HP Forums Guide Learn How to Post and More
I grasp that after installing a genuine copy of Windows 8.1 you are no longer able to control or change the display brightness.
Here is a link to the software and drivesr for your system. HP 15-r012tx Notebook PC Drivers.  Please ensure that you have all the updated drivers installed.
If you are still having an issue you can contact HP support for assistance.
Please call our technical support at 800 474 6836. If you live outside the US/Canada Region, please click the link below to get a support number for your region.
World Wide Phone Support
Good Luck!
Sparkles1
I work on behalf of HP
Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
Click the “Kudos, Thumbs Up" on the bottom right to say “Thanks” for helping!

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