Do you get any error messages if you run wmbright from the terminal?

Yes I tried that one too but no joy.     I do indeed. The developer states,     so assumed that meant "/home/user".   Still not feeling blue but thanks for the thoughts guys. 🤔

When you say /home  I assume you mean /home/user or ~:

Did you try changing the osdcolor= setting to cyan from green to see if it works? That would show if the config file is actually working, I should think.

That made me laugh. An AMD fan secretly hoarding Intel. 🤣   My first pc was AMD and I built a couple of pc's with AMD chips but with Nvidia gpu's. The AMD cpus were power slurpers though. My Skylake build was Intel and Nvidia and ran like a dream. Low power use and fast it lasted nearly ten years and is still a runner today. I was using it to play Fallout 76 on high graphics until I retired it.  My latest build  is all AMD and has been pain free at install and in running. It does however use more power when gaming. Still I am really happy with it as I could run Fallout 76 at ultra settings. I am now using it to play Skyrim with a ton of mods and it performs excellently. The secondhand Ryzen 5 laptop I bought is also a winner. One happy AMD fan here.