I’m trying to set it up so that my monitors turn off/dim while my PC stays on so that things still run in the background. I’ve turned on the power management dimming settings but the dimmed brightness is still too bright. I was wondering if there’s some config file to change and if not would it be possible to watch for the dim/wake signals in a script to set brightness manually
You can turn monitors on or off from a script with DPMS. https://wiki.archlinux.org/title/Display_Power_Management_Signaling
Usually you can manipulate screen brightness on a laptop screen from user space, but it is less common for external monitors. Whether it can be managed or not depends on the manufacturer and specific model. https://wiki.archlinux.org/title/Backlight
I hope that helps, welcome to the community @StanberyTrask. 