How to permanently disable screen dimming on Xiaomi devices: from MIUI to ADB

Automatic screen dimming on Xiaomi devices is one of the most annoying features for users who value a stable display of the picture. This option, designed to save battery power and reduce eye strain, often works inappropriately: It's especially annoying for Mi TV owners when they're reading, watching videos, or even playing games. TV smartphone AMOLED-screens where adaptive backlighting can distort colors and reduce brightness to unacceptable levels.

In this article, we’ll look at all the possible ways to disable dimming, from standard MIUI settings to hidden developer and ADB command settings. You’ll learn how to deactivate the feature on smartphones (Redmi Note 12, POCO X5, Mi 11), tablets (Pad 6) and TVs (Mi TV Q2, Redmi Smart TV X), and why dimming can return after updates and how to prevent it.

⚠️ Note: Some Xiaomi models (especially with the MIUI 14+) The manufacturer blocks the ability to completely turn off adaptive brightness through the standard menu, in such cases, additional manipulations will be required, described in the sections on the product. ADB and engineering menu.

Before you start settings, make sure that the problem is with automatic dimming, not hardware defects in the screen or firmware. If the screen dims even when manually setting the brightness to 100%, this may indicate a malfunction of the backlight or display controller.

1. MIUI Standard Settings: Where to Look for Darkening?

On most Xiaomi smartphones (including Redmi, POCO and Mi), adaptive brightness is controlled via the Settings → Display menu. However, the location of options may vary depending on the MIUI version and device model.

Here is a step-by-step algorithm for finding dimming settings:

• 📱 Open the Settings app (cog icon on the home screen).
• 🔍 Go to the Display section (or the Screen on some firmware).
• ☀️ Find Adaptive Brightness, Auto Brightness or Lighting Difference.
• 🔄 Turn off the slider next to this option. If it's not available, look for the sub-menu for additional settings.

On Mi TVs, the path will be different: Settings → Picture → Brightness → Automatic Adjustment. This may be the option of Energy Saving the screen or Light Sensor, which also needs to be deactivated.

⚠️ Attention: On devices with MIUI 13/14 After switching off the adaptive brightness, the system can force it to return through the 24–48 This is related to Xiaomi's energy saving policy, and to seal the change, go to the following methods.

2. Hidden developer settings: disable dimming through the engineering menu

If the standard methods don’t work, it’s time to activate the developer mode, which is suitable for Xiaomi smartphones and tablets, but requires caution – improper changes can lead to screen failures.

Algorithm of action:

1. Activate Developer Mode: Go to Settings → About Phone and tap on MIUI Version 7 times. A notification will appear “You became a developer”.
2. Return to the main Settings menu and open a new Developer section (usually at the bottom of the list).
3. Scroll down to the Hardware Rendering Acceleration block and find the option to Disable Adaptive Brightness (or Disable Auto-Brightness on English firmware).
4. Activate this switch and restart the device.

Some firmware (e.g. MIUI EU) may require an additional step:

• 🔧 In the same developer menu, find the minimum brightness of the screen and set the value to 0 (or 1, if zero is not available).
• 🔧 Turn off automatic contrast control (if any).

⚠️ Attention: After update MIUI Developer settings are reset. To avoid re-dimming, record the changes using the ADB (See the next section) or back up your settings through Settings → Additionally. → Backup.

Download Platform Tools from Google

Enable debugging over USB in the developer settings

Connect your phone to your PC with the original cable

Allow debugging on the smartphone screen

Check the version. MIUI customized-->

3. ADB-Teams: A Radical Solution for Stubborn Devices

If the dimming returns after a reboot or update, Android Debug Bridge (ADB) – a deep-tuning tool – works on all Xiaomi devices (including Android TVs) but requires a connection to a computer.

Instructions for turning off adaptive brightness through ADB:

1. Download Google’s Platform Tools and unpack the archive.
2. Connect the device to the PC, enable debugging over USB (in the developer settings) and confirm trust in the computer on the smartphone screen.
3. Open the command prompt (cmd) in the folder with the platform-tools and type: adb devices Make sure your device appears in the list.
4. Execute the command to turn off adaptive brightness: adb shell settings put system screen_brightness_mode 0 Here. 0 — manual, 1 — automatic.
5. Lock the minimum brightness (so the screen doesn’t dim at a low level): adb shell settings put system screen_brightness 255 (Meaning 255 correspondently 100% brightness.)

For Mi TVs, use similar commands, but with the prefix tv:

adb shell settings put global auto_brightness_enabled 0

Critical, on some firmware MIUI (For example, the Global Stable system can ignore the ADB-In this case, only unlocking the bootloader and installing custom firmware (for example, xiaomi.eu), where such restrictions are removed, will help.

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If, after the execution, ADB-When you have darkened, check for updates for Platform Tools. Older versions (below 33.0.3) may not work properly with the newer version. MIUI 14+.

4. Problems with the light sensor: how to check and cheat the system

Often, the cause of spontaneous dimming is a faulty light sensor, which can give false readings due to contamination, physical damage or a malfunction in the firmware, and can be checked without disassembling the device.

Methods of diagnostics of the sensor:

• 🔦 Install the Light Sensor Test app (available on Google Play) and compare it to real lighting. If the values jump or zero, the sensor malfunctions.
• 📱 Call the device and, while talking, cover the top of the screen (where the sensor is located) with your finger. If the brightness does not change, the sensor does not respond.
• 🔧 From the Engineering Menu (#4636###) select Sensor Information and check the Light Sensor bar.

If the sensor is not working properly, but it is not possible to replace it, you can trick the system by simulating fixed readings:

1. With help. ADB Set a fixed lighting value: adb shell settings put system screen_auto_brightness_adj 0.5 (Meaning of 0.1 before 1.0, where 1.0 — maximum brightness.)
2. Disable sensor correction: Adb shell settings put system screen_brightness_doze 0

⚠️ Attention: On devices with MIUI 14 and later, the light sensor can be integrated into the front camera module. If the dimming becomes inadequate after a fall or impact, check the integrity of the camera - replacing it can solve the problem.

5.Disclosure on Mi TVs: features and solutions

On Xiaomi TVs (Mi TV 4/5, Redmi Smart TV), the screen dimming is most often associated with power saving modes or the AI Picture Quality function.

Step-by-step instructions for Mi TV:

1. On the remote, press Settings (cogs) → Picture (Picture).
2. Select Brightness and turn it off: 🌓 Auto Brightness (Auto-Brightness) 💡 Energy Saving (Energy Saving) 🤖 AI Picture Mode (if available)

Device Preferences → Display & Sound → Screen

Ambient Light Detection

If the screen is still dimming after these manipulations, check:

• 🔌 Regime. HDMI: Some sources (such as consoles or PCs) send low-brightness signals to the TV. HDMI or change the output settings on the source device.
• 📶 Updates: in firmware for Mi TV There was a bug before version 2.0.110 that caused the brightness to drop after the reboot. → About → System Update.

6.Alternative methods: from custom firmware to physical repairs

If none of the above methods have worked, there are radical measures that should be considered only if the dimming critically interferes with the use of the device.

Option 1: Installation of custom firmware

• 📱 Xiaomi.eu or Pixel Experience Firmware Often Remove Restrictions MIUI screen settings.
• 🔧 You will need to unlock the bootloader (fastboot oem unlock) and use it. TWRP fitting.
• ⚠️ Risk: loss of warranty and possible bugs (e.g., a failed proximity sensor).

Option 2: Disabling the light sensor at the hardware level

• 🛠️ On smartphones, the sensor is located next to the front camera, and you can turn it off by cutting the contacts on the plume (requires disassembly of the device).
• 📺 On Mi TVs. TV The sensor is usually embedded in the screen frame, and you can tape it with opaque tape (like tape), but that voids the warranty.

Option 3: Use of third-party applications

Applications like Lux Auto Brightness or Tasker allow you to reset the brightness settings of the system, but on MIUI they are often blocked due to power saving restrictions.

1. Add the app to the battery optimization exceptions (Settings → Battery → Battery Optimization).
2. Grant the right to change system settings through ADB: adb shell pm grant com.vito.lux android.permission.WRITE_SECURE_SETTINGS

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Custom firmware and physical shutdown of the sensor are extreme measures. Before you use them, try resetting the device to factory settings (Settings → About Phone → Resetting). In 30% of cases, this solves the problem of blackout without risks.

7. Frequent mistakes and how to avoid them

Many users face a return of blackout after a seemingly successful shutdown, and here are the typical reasons and solutions:

• 🔄 Reset after update: MIUI often resets brightness settings when installing new versions. Before updating, back up through ADB: adb backup -f brightness.ab -apk com.android.providers.settings
• 🔋 Power saving mode: Battery mode enabled → Energy saving can force the screen to darken. Turn it off or add frequently used apps to exceptions.
• 🌙 Dark theme: Some devices have a dark theme (Settings) → Display. → Dark theme automatically lowers brightness. Try switching to light theme.
• 📱 Applications with their own brightness settings: Some games (such as Genshin Impact) or video players (such as, MX Player can override system settings. Check the brightness parameters inside these applications.

If you use Xiaomi with enterprise firmware (e.g., Mi Enterprise), dimming may be part of the security policy, in which case you can only turn it off through the device administrator.

FAQ: Answers to Frequent Questions