With my LG 32UL950-W, I've found that whether it responds depends on the cable choice. I had to give up on Thunderbolt because the monitor itself kept resetting; HDMI delivers a picture but doesn't look as good, and doesn't respond to ExternalDisplayBrightness. I'm now using a 10' USB-C to DisplayPort cable (too long for Thunderbolt) and everything works, including ExternalDisplayBrightness.
I'm curious to see if switching to Lunar would gain me anything.
https://www.nesveda.com/projects/ExternalDisplayBrightness/
With my LG 32UL950-W, I've found that whether it responds depends on the cable choice. I had to give up on Thunderbolt because the monitor itself kept resetting; HDMI delivers a picture but doesn't look as good, and doesn't respond to ExternalDisplayBrightness. I'm now using a 10' USB-C to DisplayPort cable (too long for Thunderbolt) and everything works, including ExternalDisplayBrightness.
I'm curious to see if switching to Lunar would gain me anything.