No part of this manual, including the products and software described in it, may be reproduced, transmitted, transcribed, stored in a retrieval system, or translated into any language in any form or by any means, except documentation kept by the purchaser for. In general, that your brightness control not working issue is due to the display driver. Here are two solutions you can try: Solution 1: Update your display driver. There are two ways you can update your display driver: manually or automatically.
Adjust brightness in Control Center
You can quickly adjust brightness in Control Center:
- On an iPhone X and later, or iPad with iOS 12, swipe down from the top-right corner of your display. On an iPhone 8 or earlier, or on an iPod touch, swipe up from the bottom edge of your display.
- Drag the brightness bar up or down to adjust the brightness.
Learn more about the display on iPhone X and later.
Adjust brightness in Settings
- Go to Settings > Display & Brightness.
- Drag the slider to the right or left to adjust the brightness.
From here, you can turn on True Tone*, which uses advanced multichannel sensors to adjust the color and intensity of your display to match the ambient light, so that images appear more natural.
You can also turn on Night Shift, which automatically adjusts the colors of your display to the warmer end of the spectrum—making the display easier on your eyes.
Some display accessibility settings, including Invert Colors, Grayscale, and Increase Contrast, might turn off True Tone.
About brightness levels
Brightness Does Not Stay Manual Machine
iOS devices use an ambient light sensorto adjust brightness levels based on the light conditions around you. The sensor lowers brightness in dark locations and raises brightness in light locations. The auto-brightness feature is on by default.
When auto-brightness is on, you'll notice that your device's brightness slider moves according to changing light conditions.
In iOS 11 and later, you can turn auto-brightness on or off in Settings > General > Accessibility > Display Accommodations.
iPod touch doesn't support the auto-brightness feature.
Learn more
- Brightness can affect battery life. To maximize battery life, let auto-brightness adjust your display or dim your screen.
- Use Night Shift to adjust the colors of your display.
- Learn what to do if your display won't turn on or if you have other screen issues.
* You can use True Tone with these devices: iPhone 8 and later, iPad Pro 12.9-inch (3rd generation), iPad Pro 11-inch, iPad Pro 12.9-inch (2nd generation), iPad Pro 10.5-inch, iPad Pro (9.7-inch), iPad Air (3rd generation), and iPad mini (5th generation).
MacBooks attempt to automatically manage your display brightness for you, dimming the display when you step away from an outlet and adjusting the brightness to suit the overall light level nearby. But you can adjust the brightness manually and even disable these features, if you like.
The brightness hotkeys on a Mac will only allow you to adjust an external display’s brightness if that external display was made by Apple. If you’re using an external monitor made by someone other than Apple, you’ll need to adjust the brightness directly on the display itself, as described later in this piece.
How to Adjust Brightness Manually on a Mac
You’ll find brightness-adjusting keys on your Mac keyboard, whether you’re using a MacBook or a Mac desktop with an Apple keyboard.
On a MacBook, look at the top-left corner of your keyboard. The F1 and F2 keys will decrease and increase your brightness. On a Mac desktop PC, look at the top-right corner of your keyboard. The F14 and F15 keys will do the same–look for the keys with sun logos on them. Just press the keys to decrease and increase your brightness. You’ll see an on-screen overlay appear, showing you the precise brightness level.
If these keys are set up to function as standard F-keys instead of special action keys, you’ll need to press and hold the Fn key as you tap them.
If you’re using a different keyboard with your Mac, you may find the brightness keys in a slightly different place, or you may not see any brightness keys at all. In this case–or if you just prefer using your mouse–you can adjust brightness in OS X, too.
To do so, click the Apple menu and select “System Preferences.” Click the “Displays” icon in the System Preferences window and adjust the “Brightness” slider to your desired level.
How to Adjust Brightness Manually On an External Display
If you’re using an external display made by Apple, you may see a “Brightness” slider in the System Preferences window and be able to control the brightness of your display using the keys on your keyboard.
However, these keys won’t do anything and you won’t have a “Brightness” slider in the System Preferences window if you’re using an external display not made by Apple.
If you’re using a third-party display, you’ll need to adjust the brightness on the display. Look for physical buttons on the display itself, often located near the power button. You may find dedicated “brightness up” and “brightness down” buttons, or you may have to press a “menu” or “options” button and locate this option in an on-screen menu.
How to Automatically Dim the Display When You’re Not Plugged In
RELATED:How to Increase Your MacBook’s Battery Life
Brightness Does Not Stay Manual Mac Os
Your MacBook can automatically change its screen brightness when you’re on battery power, dimming your display when you’re on battery and making it brighter when you’re plugged in. This helps increase your MacBook’s battery life.
To enable or disable this option, open the System Preferences window and click the “Energy Saver” icon. Enable the “Slightly dim the display while on battery power” checkbox under the Battery tab to make your Mac’s screen dimmer when on battery power, or uncheck it to prevent your Mac from dimming the display automatically. Just remember that unchecking it might drain your battery faster.
Unlike on Windows, you can’t customize the exact display brightness levels your Mac uses when it’s plugged in and unplugged here. However, you can adjust your Mac’s display brightness to your desired level, and this option will adjust the display brightness to be slightly dimmer than the brightness you choose.
How to Automatically Adjust Brightness Based on Ambient Light
Macs with built-in ambient light sensors can monitor the light level nearby and automatically adjust the display’s brightness level to be suitable. This means making the display brighter when it’s bright near you, and making the screen dimmer when you’re in the dark.
To find this option, open the System Preferences window from the Apple menu and select “Displays.” Enable “Automatically adjust brightness” and your Mac will use the ambient light sensor to automatically adjust the brightness. Disable this option and your Mac won’t do this.
If you don’t see this option here at all, your Mac doesn’t have an ambient light sensor.
Despite the name, this option only applies to the ambient light sensor. Even if you disable the “Automatically adjust brightness” option, your Mac will still dim the display when you’re on battery power if you have the “Slightly dim the display while on battery power” option enabled.
Using the automatic brightness features won’t stop you from being able to adjust the brightness manually. If you ever don’t like the current brightness level, you can change it with a few keypresses. However, your Mac may automatically increase or decrease the brightness level if the lightning near you changes, and you may have to tweak it again.
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