Unable to change brightness using keys as well as using slider in hp laptop 15-da1013ne

[Sreekumar_R]

I am unable to change brightness using keys as well as using slider in hp laptop 15-da1013ne.  When I press the brightness keys, it is showing increase and decrease, but the display brightness is not changing. same is the case when I tried settings-system and adjust the 'change brightness for the built in display' slider..

Kindly guide how to resolve this issue, please 

[Echo_Lake]

@Sreekumar_R

Thank you for posting on the HP Support Community.
 

Don't worry as I'll be glad to help, however, to provide an accurate resolution, I need a few more details:

• Did this happen after a recent window or software update?
• Did you make any changes to the settings of your PC prior to the issue?
• When was the last time it worked fine?

While you respond to that, let's try these steps: 

Hard Reset: Follow steps from the link: https://hp.care/2GnkMa8. (do not skip any troubleshooting steps even if you feel steps are repeating)

BIOS default:

1. Turn off the computer and wait five seconds.
2. Press the Power button to start the computer and repeatedly press the F10 key to enter the BIOS setup menu.
3. On the BIOS Setup screen, press F9 to select and load the BIOS Setup Default settings.
4. Press F10 to Save and Exit.
5. Use the arrow keys to select Yes, then press Enter when asked Exit Saving Changes?
6. Follow the prompts to restart your computer.

Hope this helps! Keep me posted for further assistance.
Please click “Accept as Solution” if you feel my post solved your issue, it will help others find the solution.