Notebook

[Nekrone]

Hello. Installed on a laptop windows 10 x64. as well as all the drivers. But the screen brightness adjustment does not work. neither in the panel, nor with the buttons, nor in the settings. HP support assistan does not help.

[A4Apollo]

Hey there! @Nekrone, Thanks for stopping by the HP Support Forums! 

I understand you have brightness issues with your PC.

Don't worry I'll try to help you out.

Did you make any software or hardware changes on your PC?

Does the issue persist in BIOS?

Please share the exact model name or product number of your PC to assist you better.

Try the steps recommended below.

1. Go into "Control Panel" and then "Power Options".

2. Click the "Change plan settings" link next to whichever plan you are currently using and then click "Change advanced power settings".

3. In this new window click "Display" to open up the listings under it.

4. Now locate and click each of the following..."Display brightness", "Dimmed display brightness" and"Enable adaptive brightness".

5. Change each of these to the settings you wish, then click the "Apply" button and finally the "OK" button.

6. You should be good.

Select Start, choose Settings, then select System > Display. Under Brightness and color, move the Change brightness slider to adjust the brightness. (If the slider isn't there, see the Notes section below.)

Some PCs can let Windows automatically adjust screen brightness based on the current lighting conditions. To find out if your PC supports this, in Display settings, under Brightness and color, look for the Change brightness automatically when lighting changes check box and then select it to use this feature. This automatic setting helps make sure your screen is readable wherever you go. Even if you use it, you can still move the Change brightness slider to fine-tune the brightness level.
Notes: 
You might not see the Change brightness slider on desktop PCs that have an external monitor. To change the brightness on an external monitor, use the buttons on it. 
If you don't have a desktop PC and the slider doesn't appear or work, try updating the display driver. In the search box on the taskbar, type Device Manager, and then select Device Manager from the list of results. In Device Manager, select Display adapters, then select the display adapter. Press and hold (or right-click) the display adapter name, then select Update driver and follow the instructions.

Try updating BIOS, graphics and chipset drivers on your PC and check if it helps.

Update the BIOS using this link. Click Here

Update the graphics driver using this link. Click Here

Also, update the chipset drivers using this link. Click Here

If you still have issues after updating the drivers try updating the drivers using HP support assistant.

Refer this article to know more information about using the HP support assistant.

If the issue still persists after trying out the steps, uninstall the graphics driver from the device manager and install the drivers using HP recovery manager.

Refer this article to know how to restore drivers using the HP recovery manager.

Also, refer this article to further troubleshoot dim display issues.

If the issue persists in BIOS it is a hardware issue with your PC.

Let me know if this helps! 
Have a pleasant day ahead! 🙂

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