You can enable reading the brightness from the display in the app's preferences, but do so at your own risk.Īdditionally, it seems the HDMI port on the 2018 Mac Mini does not work with the DDC/CI interface. Because of that, reading the initial brightness of the display is disabled by default, and when changing the brightness of a display for the first time, its initial brightness is set to 50%. There are some issues with certain Mac models which freeze when attempting to read the current brightness of the external display. Unfortunately, there is not much that can be done to remedy the situation. Most displays do, but there are some issues with Samsung displays (and possibly others), which do not implement the standard correctly. For the app to work, your display needs to support the DDC/CI standard properly. CompatibilityĮxternalDisplayBrightness uses the DDC/CI standard commands to control the brightness of external displays. This behavior is also customizable in the app's preferences. There is also an option to control the brightness of all connected displays simultaneously, by default triggered by using the keyboard shortcut in combination with the Command modifier. When pressing the keyboard shortcut in combination with Option + Shift, the brightness changes in smaller increments, just like on a real Mac. You can customize the keyboard shortcuts for the brightness actions to any of the F1 - F20 keys or the brightness keys on the Magic Keyboard (listed as MK_BDN and MK_BUP in the preferences).īy default the application takes over the default brightness keys on a Mac keyboard, which are mapped to F14 and F15, respectively. To completely quit the app, use the Quit button in the window. the app keeps listening for keyboard shortcuts when you close the preferences window. to access the preferences, simply launch the app again using Launchpad or any other method, and the preferences window will open. The app runs as a hidden agent app, silently listening for keyboard shortcuts. Grant the permission and relaunch the app for the change to take effect. Usageĭuring the first launch, the app will request permission to use accessibility services on your Mac to listen for keyboard shortcuts. To install, download the latest release, open it and drag ExternalDisplayBrightness.app to your Applications folder. InstallationĮxternalDisplayBrightness supports macOS 10.13 High Sierra and newer. I wanted to make something simple which would Just Work™ and you could forget it's even there. There are a bunch of similar projects available, but they feel hard to use and are cluttered with too many options. This is a small summer project which I did to get some practice with developing Mac apps. GitHub repo DownloadĮxternalDisplayBrightness is a small utility which allows you to change the brightness of external displays connected to your Mac using keyboard shortcuts, just as you would change the brightness of the built-in display on a Macbook. You run the risk of damaging circuits - but most likely you'll just experience a black screen when you lower the brightness below the minimum.ExternalDisplayBrightness | František Nesveda František Nesveda Projects About Contact ExternalDisplayBrightnessĪ Mac app to control the brightness of external displays using keyboard shortcuts. In general I wouldn't recommend trying to change the minimum display brightness on original Apple hardware. If you want to try dumping and patching your SSDT manually, you can take a look at this guide:Īgain note that it is intended to be used with Hackintoshes. Here's a different kernel extension that uses the ACPI method described above to control the backlight: It is only meant to be used with Hackintoshes, but it controls the same Intel integrated GPU as you have. You could also consider replacing the default backlight kernel extension with for example this: You'll be looking at for example the LMIN and LMAX parameters (LMIN/LMAX = Backlight PWM Min/Max). On modern Intel computers the PWM range is stored in the SSDT (system service descriptor table) accessible through the ACPI (Advanced Configuration and Power Interface). If you go outside that range, you're violating the specs and may cause damage to the display. The whole PWM range is usually not available, as backlights have different minimum and maximum allowable PWM ranges. The controller operates by dividing up the usuable PWM range in a number of settings (for example 20 seperate steps). In some cases this factors in an ambient light sensor. A controller - which could be the GPU or a dedicated IC - sends out the PWM signal according to the brightness level chosen by the user. In general: Display backlight is usually (and this is the case on the MacBook Pro) controlled by a PWM (pulse-width modulation) signal from 0% to 100%. The driver that controls is the "AppleBacklight.kext" kernel extension.
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