The only requirement is that your external device supports the Data Display Channel (DDC) protocol. Lunar is a free app for Mac, designed to synchronize the settings on all your displays. If you’d like to avoid tapping buttons on your monitor, you can control your preferences with Lunar. Once you’ve configured ExternalDisplayBrightness, use the keys that you selected to change the brightness on your external screen.Ĭontrol the Brightness on Your External Display with the Lunar App
Don’t click Quit just close the window. Set one key for increasing and another for reducing the brightness. Set the preferences by choosing the keys which you’d like to use to regulate brightness for your monitor. You’ll need to grant them if you want the app to serve you properly. During the installation, you’ll be asked for special accessibility access. Download the app from the app store and hit install. Use ExternalDisplayBrightness to Control Your Monitor’s BrightnessĮxternalDisplayBrightness is a popular app that allows you to manage the brightness of your external device. Apart from using the keys on your monitor, here’s what you can do to control the brightness on all of your displays. When you hear the second start-up tone (or, on a Mac Pro, see a second Apple logo appear and disappear), you can release the keys and let the computer finish its start-up sequence.While you normally can’t use the brightness keys or system preferences to control the behavior of external hardware, some apps make it possible to do so. You can reset the NVRAM or PRAM by shutting down the Mac and then starting it up again while holding down the Option, Command, P and R keys all at once. If the Mac is not maintaining its settings for volume level, display resolution, time-zone information or preferred start-up disk, information held in the NVRAM may have become corrupt. 
Modern Macs also store some settings in an area of the system called the nonvolatile random access memory (NVRAM) older Macs use parameter random-access memory (PRAM) in a similar manner. might fix erratic Mac behavior, although it will not help with a damaged power supply or another major hardware problem. (You may also have to redo any preferences for your display and power-management settings.)
While performing a reset does not generate an alert box or notification, you can tell if you were successful if the odd Mac behavior stops. The guide also lists a series of things you should try before resetting the S.M.C. reset process for all its Intel-based Macs, including those with removable batteries and desktop models. Apple’s support site has a full guide to the S.M.C.
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