Modern Xiaomi smartphones are equipped with intelligent systems that try to guess the preferences of the user. One of the most intrusive functions is automatic adjustment of the brightness of the screen. On the one hand, this is convenient, since the gadget itself adapts to the ambient light. On the other hand, algorithms often work incorrectly, darkening the screen at the wrong time or, conversely, twisting the backlight to the maximum in the dark.
Many owners of devices based on MIUI or the new HyperOS face a situation where the screen becomes dim just when you want maximum readability, for example, when watching videos on the street or while navigating. Constant jumps in brightness are not only annoying, but can tire the eyesight, causing the user to constantly reach for the adjuster slider.
Fortunately, the system allows you to completely turn off this mode or fine-tune its behavior. In this article, we will discuss in detail where to look for the necessary switches, how to bypass hidden settings through the engineering menu, and why the light sensor can behave strangely, you will learn to control the backlight in a way that is convenient for you, not for algorithms.
Why turn off automatic light regulation
The main reason users are looking for a way to deactivate autobrightness is because the sensor is unpredictable, and the light sensor next to the front camera reads the amount of light that hits the top of the smartphone, but it often responds to a hand shadow, a change in the angle of the device, or a sudden change in color on the screen.
In addition, automatic mode often lazy the screen in situations where maximum detail is critical. Xiaomi aims to save battery power by artificially lowering the brightness, even if the energy reserve is sufficient for more intensive work, this is especially noticeable in games or when working with graphic editors, where color accuracy is important.
⚠️ Warning: Turning off the light sensor completely means you have to manually monitor the backlight level. On a sunny day, the screen can become unreadable, and at night it can become blinding if you forget to turn it down.
Another important aspect is the life of the matrix: constant work at maximum brightness, which is sometimes imposed by automation in an attempt to “compensate” external conditions, can lead to faster burnout of pixels, especially on the surface. AMOLED-Manual control allows you to keep the brightness at a comfortable, safe level.
Basic setting through the notification curtain
The fastest way to change backlight settings is to use a control panel, which is standard on all firmware versions, from the old MIUI 10 to the current HyperOS, which requires no deep immersion in the settings menu and takes only a few seconds.
You first need to unlock the device and swipe from top to bottom to open the control center. Depending on the version of the shell, the sliders can be in a separate tab or be combined with notifications. Find the slider with the sun icon, which is the brightness regulator.
And there's often a button next to the slider that has an "A" button or a sun icon that has the rays, and that's the element that controls the automatic mode, and if it's active, it can be locked or moved by itself, and pressing the button turns off the system's interference.
☑️ Algorithm of turning off autobrightness
It's worth noting that in some design themes, the interface may look different. If the standard button isn't visible, try pressing the slider itself or holding your finger on the sun icon. In newer versions of the MIUI shell, when autobrightness is turned on, the slider splits into two parts, showing the current value and the one that the system recommends.
Deep tuning in the screen and brightness menu
If the fast switch is not enough or not available, you need to refer to the main settings of the system. Here are the more subtle parameters that affect the operation of the display, the path to these may vary slightly depending on the regional version of the firmware (Global, China, EEA).
Go to the Settings menu and select the Screen and Brightness section. In some versions of HyperOS, this item may be simply called "Display." Inside, you'll see a brightness slider and a "Auto-Tune" switch. If you turn it off, you'll have full control of the backlight.
However, even after the main function is turned off, there may still be smart assistants in the system, for example, the Adaptive Brightness function can learn how you do it. If you constantly manually turn down the lights after you turn on auto mode, the phone will remember this. But for complete peace of mind, you better check the additional items.
| Parameter | Location. | Impact on the system |
|---|---|---|
| Auto-tuning | Settings → Screen | Full control of the light sensor |
| Dark subject matter | Settings → Screen | Changes background, but not brightness |
| Reading mode | Settings → Screen | Reduces the blue component |
| Eye safety | Settings → Screen | Twinkling and color reproduction |
The screen and brightness section also features a frequent option called "Brightness Level" or "Advanced Adjustment" that allows you to adjust multiple brightness levels for different conditions, even if the main auto mode is off, a useful trade-off for those who don't want to give up the gadget entirely.
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If the brightness slider is gray and not moving, check to see if the power saving mode or the Super-Energy Saving mode is on, which often blocks manual settings.
Hidden functions and developer mode
For advanced users who didn't find the options in the standard menu, there's a developer mode, which is a hidden partition designed to debug applications, but which also contains useful display settings, and activating this mode requires several actions.
Go to Settings. → About the phone. Find the line "Version." MIUI» or "Version" OS» And press it fast. 7-10 It'll tell you you've become a developer, and then it'll show you a new option in the settings menu, "Additional" or "Developer-friendly" right away».
Inside the developer menu, you should look for items related to the display, and we're interested in options like "Show touch," "Window animation," and possibly "Scaling DPI." However, direct shutdown of the light sensor is rare here, but you can find settings that affect the color profile and gamut, which indirectly affects the perception of brightness.
⚠️ Warning: Be extremely careful in the developer menu. Changing unknown parameters can lead to unstable system operation or resetting.
There's also an engineering menu that's available through the code in the call, like ##6484##. In the CIT section, you can run a proximity and light sensor test, and you can see raw data from the sensor and see if it's physically functional or if the software is the problem.
Problems with the light sensor and their solution
Sometimes users want to remove the autobrightness not because it is uncomfortable, but because it is not working properly because of a malfunction.If the screen spontaneously changes brightness even after the feature is turned off, or the slider "jumps", it may be contaminated or damaged the sensor.
The light sensor on Xiaomi smartphones is often combined with the proximity sensor and is located at the top of the screen, hidden under the glass. Protective films, poor-quality glass or even greasy spots can distort the readings, as a result of which the phone “thinks” that it is in the dark, and extinguishes the screen.
You can use third-party apps from Google Play to diagnose this, which display sensor readings in real time, and if you hold your hand up to the top of the screen, you can see that the sensor is locked or malfunctioning, and in this case, software to turn off autobrightness is the only temporary solution.
- 🧼 Clean: Wash the top of the screen with microfiber carefully, paying attention to the area around the speaker.
- 🛡️ Protective glass: Check if the protective glass or film covers the sensor area (often with poor-quality accessories).
- 🔄 Calibration: Try calibrating the sensor through an engineering menu or special calibration apps.
- 🔧 Hardware reset: In rare cases, a factory reset helps if the problem is caused by a software glitch of drivers.
What to do if the sensor is filled with liquid?
The effect of energy saving on the brightness of the screen
The interaction of autobrightness with energy saving modes deserves special attention. MIUI is known for its aggressive optimization. When you turn on the "Energy Saving" or "Ultra-Saving" mode, the phone forcibly reduces brightness and can ignore your manual settings.
If you notice that the screen is dimmer than usual, check the battery status. In the Battery and Performance section, you can adjust profiles. In Balance or Performance mode, brightness restrictions are removed, but autobrightness can still interfere if it is active.
It's also worth checking the settings of specific applications. Some versions of the shell have an "Application Adaptive Brightness" feature that changes the screen settings when you start video players or browsers for reading. Turn off this option if it interferes.
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Power saving modes take precedence over manual brightness settings. Use Performance mode for maximum control of the screen or turn off energy savings completely.