The name of the directory depends on the graphics card model. An interface to this module is provided via a sysfs(5) directory at /sys/class/backlight/. The power level can often be controlled using the ACPI kernel module for video. The brightness of the screen backlight is adjusted by setting the power level of the backlight LEDs or cathodes. In this case, perceived screen brightness can be adjusted with a PWM control (not implemented in the Linux kernel) or via software color correction. I like my display bright as bright can be most of the time, so I’m willing to drain my battery a bit faster to get to see my screen all lit up and stuff.Note: Since OLED screens have no backlight, brightness cannot be controlled by changing backlight power on laptops equipped with an OLED screen. The keyboard backlight drains your battery, of course, so just like the display brightness, you’ll want to adjust these settings appropriate to your level of tolerance for battery usage. Within System Preferences > Keyboard > Keyboard, you can also configure how long you’d like the backlight to stay on after your Mac stops being used.
To change the brightness level of this afterward, again you can use the proper function keys (usually F5 and F6) or the controls on your Touch Bar, which look like…um…little sunrises? Of which the smaller one makes the backlight dimmer? These things are hard to describe, my friends. To do that, visit Apple Menu > System Preferences > Keyboard, and under the “Keyboard” tab, deselect “Adjust keyboard brightness in low light.” If you’ve got a laptop where the keys glow a bit, you can again either let the Mac decide how bright to make that glow or force it to stay at a brightness level you specify. Those function keys are usually F1 and F2, but you’ll note they’re the ones with the sun icons on them.įinally, there’s one more way to disable auto-brightness functionality-by doing so for your backlit keyboard. Once you deselect that option, your screen will no longer brighten or dim without your say-so! Of course, you can manually adjust that setting either from this same System Preferences > Displays > Display pane using the “Brightness” slider shown above, or you can use the appropriate function keys (or the Touch Bar) on your keyboard.
Click on the Apple Menu at the upper-left corner of your screen and choose System Preferences.
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