![]() Mike replies: To your first point, I admit that that seems improbable, and, on the face of it, suspicious. Much in the only comment section I regularly read on the web." His band of contributors, as well as the wonderful group that adds so Brightness latest version: Simple screen brightness controller for your desktop. I kid! Thanks for another great year of reading here on TOP to Mike and Brightness for Mac, free and safe download. Patrick Perez: "So it has come to this: Mike Johnston is providing computer tech Scott: "Further, if you want fine control over brightness, as when profiling, and one 'block' is too much, push the Shift & Option keys as you push the brightness key and the levels go up and down in one quarter stops." ( To see all the comments, click on the "Comments" link below.) Links in this post may be to our affiliates sales through affiliate links may benefit this site. Original contents copyright 2012 by Michael C. Hope this helps someone out there at some point. Do the F1 and F2 function keys work to control brightness Note: Depending on System Preferences > Keyboard, you might have to press the Fn key as well. (This also activates the USB ports on the external monitor, so it has that additional benefit.) The Brightness slider then magically shows up in the appropriate control panel. The solution is that, although the external monitor works in every other way with just the Mini DisplayPort cable connected, to restore the brightness control you ALSO have to connect the USB cable. It stumped a number of Apple experts, to the point that the AppleCare Tech Support Supervisor was about to submit a help ticket to the Apple engineers in Cupertino. With help from several experts, I tried about half a dozen possible solutions over several days. There is no physical brightness control on the 27" LED Cinema Display, and when you connect the secondary monitor through the Mini DisplayPort, although everything else seems to work fine, there is no virtual brightness control for the second monitor in the System Prefs->Displays panels either, regardless of how you have the monitors arranged. When setting up a non-Thunderbolt Apple 27" LED Cinema Display as a secondary monitor for an iMac (mine is a 27" iMac 11,3, 2.8 GHz Intel Core i5, mid-2010), there can be a problem controlling brightness on the secondary monitor. Download QuickShade for free from the Mac App Store. I'm posting this purely as a potential service for anyone who might be Googling for a solution to the same LED Cinema Display screen brightness problem I wrestled with last week. How to dim your Mac’s display even further. Do they work? Exit Safe Mode (just restart your Mac normally) and test your problem again.Having problems with the brightness control on an external LED Cinema Display? Could you please also give me a hint how to control the brightness of an external display, like a. Click Continue in Safe Mode and then release the Shift key. works perfectly fine on my MacBook with the build-in display.Select your startup disk, e.g., Macintosh HD.Press and hold the power button until the startup options window appears.Keep holding the Shift key until you see the login screen.Restart your Mac and immediately press and hold the Shift key.And wait for your Mac to power off completely. ![]() Note: You may go to the Apple menu > About This Mac to figure out if you have a Intel-based or Apple silicon Mac. Simply restarting your Mac in Safe Mode may help you fix your problem. Boot into Safe Mode, test your problem, leave Safe Mode and test your problem again. ![]() If resetting NVRAM does not work, you may want to reset the SMC to see if this resolves. Then try to adjust your brightness to see if it starts working. Then release the keys after the second startup sound or the Apple logo appears and disappears for the second time.
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