This works in Now the question is how to change the brightness on a tertiary display.
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Click here to return to the ' Search Advanced From our Sponsor User Functions Username: Password: Lost your password? I could not find that quickly on my own. Which is why I did NOT go into detail about it Sep 28, AM. Sep 28, AM in response to lllaass In response to lllaass. I did try that when the keyboard did not work.
I just tried that and unfortunately it did NOT work either.
I don't know what else I could do? Everything else works fine I know this is late, but may help others in the same boat. I had the same problem with my external monitors. This free app, "Brightness Slider," worked for controlling my external monitors' brightness. Nov 26, PM.
GitHub - ojotoxy/Brightness: Sync macbook screen brightness to non-Apple external display.
Nov 26, PM in response to lllaass In response to lllaass. I use a slightly older in cinema display, and if you get the USB unplugged, the slider does nothing. Brightness control only affects the one on the left, so adjust after swap, then swap back. Nov 27, PM. Jan 8, AM in response to lllaass In response to lllaass.
Jan 8, AM. If you have keyboard controls that raise and lower the monitor brightness of any of yourscreens, you can raise and lower the brightness of the second or third screen simply by making a program's window active on the desired screen and pressing the brightness keys.
This works on my MacOS Jan 20, AM. Question: Q: Brightness on external monitor More Less. Communities Contact Support. Sign in Sign in Sign in corporate. Here's what I discovered: The external keyboard controls the external display's brightness, regardless of which display was set to the primary menu bar. I find the keyboard will adjust the brightness on the secondary display only, but the MBP keyboard will adjust it's display.
A little inconvenient to reach over to the laptop keyboard, but it is good to be able to adjust both displays independently. I can adjust the brightness of my Macbook with my external keyboard even when I have a second monitor attached.
It doesn't matter which of the two screens has the menu bar and the dock if that is what you mean by primary screen or if they are synchronized. Hold down option and hit one of the brightness keys to pull up the display settings in System Preferences bonus hint!
Then drag the menubar from the currently primary monitor to another one. Also ctrl-F1 and ctrl-F2 usually change the brightness on the other display or external display on On the Thunderbolt display, this works the same but no USB cable is present or required.
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This is more of an FYI than a deep hint. Apparently in Lion, you can now adjust the screen brightness of your Mac even if it's the secondary display in a dual monitor setup. I'm using an i7 15" MacBook Pro, and before Lion, if my laptop was set as the secondary display, the brightness buttons on my Apple external keyboard didn't work. The brightness buttons only worked if the display was set as the primary display.