How to turn off autobrightness on Xiaomi: the complete guide

Modern Xiaomi smartphones, which are based on MIUI shells or the new HyperOS, are equipped with advanced algorithms for adaptive backlight control. The system automatically analyzes ambient lighting with a sensor located next to the front camera and adjusts the brightness of the screen to save battery power and eye comfort. However, despite the technology, this mechanism often works incorrectly, causing irritation to users.

The situation when the screen suddenly goes out in a dark room or, conversely, blinds in the middle of the night, is familiar to many owners of Redmi and POCO devices. Often this is due to aggressive sensor calibration or software glitches in the operation of display drivers. Users are looking for ways to turn off autobrightness on Xiaomi to get full manual control over the visual parameters of their gadget.

In this article, we will discuss all available methods of deactivating automatic adjustment. We will look at standard system settings, hidden engineering menus and additional utilities that will help solve the problem. You will learn to control the backlight as convenient as you want, without intrusive intervention of the operating system.

Before we go to radical measures, it is worth checking the basic parameters of the display. Sometimes the problem lies not in the auto-regulation function itself, but in conflicting energy saving modes or the features of the operation of a particular application. Understanding the principles of the light sensor will avoid typical errors in setting.

Standard method of disabling through system settings

The easiest and safest way to remove automatic adjustment is to use the built-in operating system tools. The interface of MIUI and HyperOS is almost identical in this aspect, so the manual will suit most models, from the budget Redmi Note to the flagship Xiaomi 14.

Open the Settings app and find the Screen (or Screen and Brightness) section. At the top of the screen, you'll see a manual slider and an Auto Brightness switch. If the switch is active (lit in blue or orange), the system changes the backlight settings itself. Press it to deactivate the function.

⚠️ Warning: Once the autobrightness is turned off, the manual slider may become inactive (grey) in some firmware versions if the "Brightness Mode" is turned on. First turn off the high brightness mode, then uncheck the autosetting box.

Sometimes users can't find the switch right away because it's hidden in the extended menu, so click on the gear icon or the three dots in the corner of the display settings screen, and there may be an additional Adaptive Brightness option that also requires you to turn off. Make sure you change the settings specifically for your current user profile.

💡

After turning off the autobrightness, set a comfortable lighting level manually (about 40-50%) and do not change it abruptly.

Use of notification curtain and control centre

To quickly adjust the backlight settings, you don't have to go into the deep settings menu every time. The MIUI shell provides easy access to basic functions through the Control Center, which is especially true when you need to respond quickly to changing external conditions, for example, when you leave the room in the bright sun.

Swipe down from the top right corner of the screen (or from the top edge, depending on the style of the curtain) to open the control panel. You will see a horizontal slider with a sun icon. On or to the right of it is often the A button or the words "Auto". Pressing this button instantly switches the mode of operation of the sensor.

• 📱 If indicator A is on blue, the automatic adjustment is active and the light sensor is working.
• ⚪ If the indicator is gray or absent, you control the brightness exclusively manually through the slider.
• 🌞 When moving the slider manually, the system can temporarily block autobrightness until you press the A button again.

It is important to understand that in some use cases, for example, when you run certain games or video players, the system can force the brightness to increase, ignoring your settings. This is due to the operation of the MEMC function or real-time image optimization. Check the settings of a particular application if the screen behavior seems strange.

Problems with the light sensor and their solution

There are situations where the user wants to turn off the autobrightness, but the switch is missing or inactive. This is a classic symptom of a malfunction or contamination of the light sensor. If the system does not receive data about the environment, it can block manual control or, conversely, keep the brightness at maximum.

The first thing you need to do is check the physical condition of the top of the screen. Fat spots, low-quality protective film or a high-sided case can block the light from accessing the sensor. Wipe the area around the front camera and the speaker with a soft cloth. Make sure that the protective glass is glued flat and has cutouts for the sensors.

If the physical cleaning didn't work, you might need software calibration. You can check the sensor readings on the engineering menu or through special applications. Type ##6484## in the Phone app to go into testing mode. Find the Light Sensor or Proximity Sensor test and see how you change your values when you close the top of the screen with your hand.

⚠️ Warning: Don't change the values in the engineering menu if you're not sure what you're doing. Resetting the sensor calibration can cause the screen to always be dull or, conversely, burn out your eyes, and it will be difficult to return factory settings without flashing.

In cases where the sensor is completely out of order, the system may not allow to turn off the autobrightness, considering it a critical function, in which case the only way out is to use third-party applications-reinterpreters or reset the settings to the factory, which, however, will delete all user data.

Hidden settings and third-party applications

When standard methods fail, advanced tools come to the rescue. Android’s shell allows you to change system settings through ADB (Android Debug Bridge) or specialized utilities, which gives you access to hidden flags that are not visible in the normal interface.

One effective way to do this is to use brightness control apps like Screen Brightness Controller or Lux Auto Brightness, which intercept system commands and impose their values, and you can create a profile where the autobrightness is forced off and the backlight level is fixed at a certain percentage.

For users who are ready for more complex manipulations, the method is available through ADB-By connecting the smartphone to the computer with debugging enabled. USB, You can type in a command to change the global setting of the screen, for example, the command can prevent the system from changing the brightness level automatically.

settings put system screen_brightness_mode 0

This command compulsorily sets the brightness mode to "manual" (0). "1" usually means automatic mode. However, after the device is restarted, some settings may be reset, so you may need to re-enter or use applications that save the profile when you boot.

💡

Using third-party brightness control applications is the most flexible way to create scenarios (e.g., “Night” or “Reading”) that completely ignore the system limitations of MIUI.

Impact of energy saving regimes and topics

Often the cause of "walking" brightness are not the display settings, and aggressive algorithms to save energy. In Xiaomi smartphones, the mode of Energy Saving or Super-Economies can forcefully reduce the brightness and block the possibility of increasing it, creating the illusion of autobrightness.

Check the battery settings. If you have saved mode on, try turning it off and see if the screen behavior changes. You should also pay attention to the installed themes. Some third-party themes from Themes store may have their own display profiles that conflict with system settings.

Below is a table showing how different factors affect the ability to control brightness:

Also worth mentioning is Reading Mode, which changes color temperature and can reduce brightness to simulate paper. If this feature is on all the time, the screen may seem too dim even when the autobrightness is turned off. Check the settings in the Screen → Read section.

Frequent Questions and Troubleshooting (FAQ)

Despite the detailed instructions, users often have specific questions about unique situations or rare device models, and the following are answers to the most popular queries that will help resolve the remaining ambiguities.