But, you can just close your MacBook and then you can dim all 3 externals. Control your desktop monitor brightness and volume just like on a MacBook Credit of this application in here Monitors compatibility Your monitor needs to support DDC/CI for this app to work.

If you have 3 externals this means you can't dim the far right one. This a utility application to control the brightness and volume of an external monitor directly from your keyboard. Also of note it allows for dimming up to 3 monitors but remember your MacBook does count as 1 if it's open. can't dim completely separately - this works for me as I use it to dim the 2 side monitors so they don't distract from the main middle monitor)Įdit2: The website appears to be down so here is the App Store link. My 3 external displays are non-apple (1 Dell with displayport, 1 samsung with displayport->dvi, and 1 old acer 19' with hdmi->dvi) on a MacBook Pro Retina 15' with 10.8.2.Įdit: For the OP's question this shouldn't matter, but fyi for 3 monitors - it seems to only allow one combination of monitors for dimming (i.e. Sits in menubar, and has a simple slider and monitor selector, as well as keybindings for brightness increase/decrease. Seems nice and elegant the short time I've used it. Screen Dimmer isn't free ($2), but is the only tool I could find that handles multiple monitors (up to 3).