It simply inserts an overlay graphic with an opacity setting so it darkens the screen by covering it. There's one on the App Store I found that looks like it works well, but it's badly implemented. To decrease the brightness or contrast press (-) button & to increase. Press to switch functions or adjust settings. I haven't found any good apps that resolve this. .the Brightness/Contrast adjust functions. It's tedius, multi-step, awkward and worse if you have more than one external monitor. That's unfortunate since there's an industry standard DDC protocol to make it possible to control brightness 'over-the-wire'.Īdjusting Dell monitor brightness from the physical panel button/menu is a hassle. The Dell 4K monitors work fine.īut Apple dumped its monitor business without creating a way to adjust 3rd party monitor brightness from the keyboard. Recently announced an ungodly expensive 'reference monitor'īeyond the need and budget of most people.įor my iMac, I bought two Apple-recommended 4K Dell monitors to go with my retina iMac.

Apple stopped Thunderbolt display and Cinema display line.

Adjust brightness on dell monitor