How to Fix Brightness Control Failure After Update Windows 11

One day, when you open your computer, you find that the brightness of your computer suddenly becomes maximum and the built-in brightness control button on your keyboard is not working. After opening the setting bar in the lower right corner, there is only a sound control bar and no brightness control slider as before, you finally decide to check it from the display settings, but you still can not find any brightness adjustment option here. "I'm going blind!". A lot of users counter this problem after their computer updates to the latest Windows 11. So how to fix brightness control failure after updating Windows 11? This article may solve your problem with serval useful methods. Check it out.

• Way 1 : Change the Registry Settings
• Way 2 : Uninstall or Disable Monitor Device and Restart Your Computer
• Way 3 : Update the Driver of Your Display Device
• Way 4 : Adjust Brightness from Display Card Control Panel
• To sum-up

Way 1 : Change the Registry Settings

Step 1: Press "Win" ＋ "R" and type "regedit" to open the Registry Editor program.

Step 2: Open the following url on the left column.

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Class\{4d36e968-e325-11ce-bfc1-08002be10318}

Step 3: Find the 0000 and 0001 folder. Right click it and select "New-DWORD (32bit) value".

Step 4: Rename it with the following name and double click it, change its value to "0".

KMD_EnableBrightnessInterface2

Step 5: Following Step 4 do the same thing in 0001 folder.

Step 6: Restart your computer and check the screen brightness control.

Way 2 : Uninstall or Disable monitor device and restart your computer

Step 1: Right click the start button and choose the device manager option.

Step 2: Open the monitors tree and find your dispaly device.

Step 3: Right click it and choose Uninstall or Disable option.

Step 4: Restart your computer and check the screen brightness control.

Way 3 : Update the driver of your display device.

Step 1: Follow Way 2 until you find your display device.

Step 2: Double click it and find the driver option.

Step 3: Click update driver, you can choose update your driver automatically or manually.

Step 4: Restart your computer and check the screen brightness control.

Way 4 : Adjust brightness from display card control panel.

Step 1: Right click your desktop and choose your display card control panel. (this image use NVIDIA as example)

Step 2: Find the display settings and you can control the brightness here.

To Sum-up

This post mainly share 4 ways for you to bring your brightness control bar online, hope you can share with others with our post and thank you for your reading!