KDE Display Brightness Control Not Working on OpenMandriva

I am currently using OpenMandriva Lx ROME and I love it. It boots and loads really fast on my AMD Ryzen laptop. Unfortunately, KDE's brightness control is not working and I have to use xrandr to control the brightness manually.

The Simple Solution

After reading random forums about this not-really-uncommon issue, I've successfully solved the issue by these following simple steps:

Using your favourite text editor, edit /etc/default/grub
In GRUB_CMDLINE_LINUX_DEFAULT
remove acpi_backlight=vendor
then, add amdgpu.backlight=0
Update grub:
sudo grub2-mkconfig -o /boot/grub2/grub.cfg
Reboot the system. Now, the KDE's brightness control should work properly.

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