I believe you're correct in that the older Studio Display needs an older Mac to use the brightness button on Mac OS X. The power adapter (which you didn't show plugged in, so hopefully you tried that) needs to be a higher wattage or the original wattage to work with the Cinema Displays too - if you have the 23", you'd need the 90W adapter. If yours is a 20", then the 65W should work. It's amazing that these old displays just work and show up in modern macOS with a bunch of adapters though still!
I'm using a 2004 cinema display with a M2 mac mini- managed to get a genuine Apple DVI-HDMI plug for it. Great monitor minus the annoying goddamn power brick!
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I believe you're correct in that the older Studio Display needs an older Mac to use the brightness button on Mac OS X. The power adapter (which you didn't show plugged in, so hopefully you tried that) needs to be a higher wattage or the original wattage to work with the Cinema Displays too - if you have the 23", you'd need the 90W adapter. If yours is a 20", then the 65W should work. It's amazing that these old displays just work and show up in modern macOS with a bunch of adapters though still!
Que molesta la luz de encendido parpadeando
I'm using a 2004 cinema display with a M2 mac mini- managed to get a genuine Apple DVI-HDMI plug for it. Great monitor minus the annoying goddamn power brick!
I was expecting to see a dual link to DP adapter