Troubleshoot

HP Pavilion 15 – screen brightness not working after install Windows 10

You can find all of the drivers you need for your model at the link below.

https://support.hp.com/us-en/drivers/selfservice/hp-pavilion-15-cs0000-laptop-pc/20284004

You do realize that you also need to install the Intel HD graphics driver, correct?

Your notebook has the nVidia/Intel switchable graphics, so you have to install both drivers in order for the graphics to work correctly.