Im on KDE Manjaro.
I have an OLED panel on my Dell XPS 15 7590 Laptop.
Here https:// wiki.archlinux. org/index.php/Dell_XPS_15_7590#Backlight I read to install linux-oled from the AUR.
Installing linux-oled I had this problem:
[...]
==> Verifying source file signatures with gpg...
archlinux-linux git repo ... FAILED (unknown public key 3B94A80E50A477C7)
==> ERROR: One or more PGP signatures could not be verified!
Failed to build linux-oled
This worked! Now I can finally control my brightness!
Thank you very much
Sorry if I didnt quite understand what you meant at first. Still new to linux. And manjaro as a first distro is tuffer than others I believe.
No worries. We are here to guide and sometimes push members to keep on investigating. In time, so be patient, things will get more clear and you will be amazed by how much you learned
Cheers!