Screen light auto turn dark when I use program/web with background dark in windows 8.1

Hi there,
I used HP Pavilion dv6t-6000 CTO Quad for 3 years.
CPU: Intel core i7-2630QM
GPU: AMD Radeon 6490m
It build in windows 7 and I manual install ( fresh install ) windows 8. It's fine. But when I upgrade to windows 8.1, it have an issue and I really hate it.
When I use "Sublime Text" ( with background is black ), the screen light is become darker. And when I back to ( e.g: a website with background is white ), the screen turn back to lighter.
I tried many ways, included 4 ways here but it's NOT WORK.
NOTE: When I used Option 1 ( upper )
1. Open PC settings, and click/tap on PC and devices on the left side
2. Click/tap on Power and sleep on the left side, and turn on or off Adjust my screen brightness automatically on the right side under Brightness.
==> It's NOT SHOW button "Adjust my screen brightness automatically". It mean: I have NO built in auto brightness sensor.
I think this issue is about AMD driver or Intel Graphic driver.
Is anybody have idea???

Hi @kolz,
Welcome to the HP Forums!
It is a wonderful place to find answers and solutions!
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 updating your system from Windows 8 to 8.1 you are having an issue with the display going dim.
You have tried some steps you located on the web but there was no change.
Windows 8 an 8.1 are not supported Operating Systems for your notebook. This does not mean they will not work only that HP has not tested it and therefore does not supply updated drivers. You would need to check the manufacturer's site for any updated drivers.
Downloading or Updating Software and Drivers for HP Computers
When I checked the driver page for your notebook I did notice there is a bios update, have you done that?
HP Pavilion dv6t-6000 CTO Quad Edition Entertainment Drivers and Software
As a bios update does have a potential to cause damage I suggest contacting HP support for assistance with that process.
Updating the BIOS
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!
Here is a link to Troubleshooting a dim display (Windows 8, Windows 7 and Windows Vista)
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.
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