Why is the Xiaomi Redmi 9T screen going off too fast?
Owners of the Xiaomi Redmi 9T often face a problem: the screen goes out after 15-30 seconds of inactivity, even if you read an article or watch a video. This is standard MIUI behavior, configured to save battery power. However, in some scenarios - for example, when using the phone as a navigator, while streaming online or reading long texts - constantly turning on the screen is annoying and distracting.
The reasons for the automatic disabling of the display lie in the Sleep and lock settings, as well as in the energy saving policy. MIUI. By default, the system sets a minimum timeout (15 seconds) for models with a AMOLED-screens and 30 seconds for IPS-matrices (like Redmi) 9T). In addition, adaptive brightness and battery modes can further reduce display activity time.
In this article, we’ll look at 5 proven ways to turn off screen auto-turning, from standard settings to hidden features for developers. All methods have been tested on Redmi 9T with MIUI 12.5-14 firmware.
Method 1: Change the timeout in standard settings
The easiest method is to increase the time to automatically turn off the screen through the settings menu, which does not require superuser rights and works on all versions of MIUI.
Instructions:
- 📱 Open the Settings app (cog icon on the home screen).
- 🔍 Go to the Display section (or the Screen in some firmware).
- ⏱️ Find Sleep Mode (or Time Out of the Screen) and tap it.
- 📝 Choose the maximum value of 10 minutes or 30 minutes (depending on version). MIUI).
Limitation of method: even a maximum value (30 minutes) may not be enough for some tasks, and after restarting the phone, settings are sometimes reset.
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If you don’t have “Sleep Mode” on your menu, upgrade to the latest version of MIUI. In older versions, the path may be different: Settings → Lock and Protection → Sleep mode.
Method 2: Disconnection through Developer Mode
For advanced users of Xiaomi Redmi 9T, there is a hidden developer mode where you can turn off the screen timeout completely. This method requires the activation of the Developer Option.
Steps:
- Activate the Developer Mode: 🔧 Go to Settings. → The phone. 📱 7 times tap on the item Version MIUI (A notice will appear saying, “You have become a developer!").
Additional → For Developers
Sleep while connected to charging
Never turn off the screen.
Never.
Don't turn off the screen.
Important! Once this setting is activated, the screen will remain on only when connected to the charger. The battery will require third-party applications to run (see Method 4).
Is the mode activated (7 taps according to version) MIUI)|
Is the item "Sleep when connected to charging" found"|
Has the meaning “Never” been established"|
Reload the phone to apply changes-->
Method 3: Use the Reading function (for MIUI 13/14)
In the latest versions of the firmware MIUI 13 and MIUI 14 there is a built-in function Read Mode, which automatically increases screen timeout when you open certain applications (browsers, books, PDF-reader).
How to turn on:
- 📖 Open the Settings. → Display. → Reading mode.
- 🔄 Activate the switch Automatically turn on.
- ✅ In the Reading App list, mark those programs where the screen should not go out (e.g. Chrome, WPS Office, Moon+ Reader).
- ⏱️ Set screen timeout in this mode to maximum (30 minutes).
The advantage of the method is that it does not require developer rights and it works autonomously. Disadvantage: it only works in selected applications.
How to add an application to the list of "Read Mode"?
Method 4: Third-party applications for constant illumination
If the built-in methods don't work, you can use specialized utilities from Google Play, which bypass the limitations of MIUI and allow you to keep the screen on indefinitely.
Top.-3 tested applications:
| Name of name | Functions | Does it require ROOT? | Reference |
|---|---|---|---|
| Keep Screen On | Keeps the screen on, working with a white list of applications | ❌ No. | Download |
| Caffeine | Activated through the notification panel, the turn on timer | ❌ No. | Download |
| Screen Alive | Works in the background, gesture support for on/off | ⚠️ Partially (for some functions) | Download |
Warning: Some applications may conflict with MIUI's energy-saving features. If the screen goes out anyway, add the utility to the battery optimization exception list:
- 🔋 Go to Settings. → Battery and productivity → Optimizing the battery.
- 🔍 Find the app in the list and select Without Limits.
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Applications like "Keep Screen On" consume extra battery power, and use them only when connected to a charge or with a powerful power bank.
Method 5: ADB commands to completely shut down timeout
For users who are willing to work with ADB (Android Debug Bridge, there's a radical method of turning off system-level timeouts. It's the only way to completely remove the auto-shutdown of the screen even without a charger connection, but it requires a computer and a computer. USB-cable.
Instructions:
- 💻 Install. ADB-PC drivers.
- 📱 Turn on Debugging. USB on the phone (Settings) → For developers).
- 🔌 Get Redmi on board. 9T to the computer and confirm the debugging permission.
- 🖥️ Open the command line (Windows) or the terminal (Mac/Linux) Enter: adb shell settings put global stay_on_while_plugged_in 3 This command will keep the screen on at all times, regardless of the power source.
- 🔄 Restart your phone to apply changes.
To return the standard behavior, follow the command:
adb shell settings put global stay_on_while_plugged_in 0⚠️ Attention: misuse ADB Do not change other system settings without understanding their purpose.
Comparison of methods: which one to choose?
Each of these methods has its pros and cons, the choice depends on your tasks and level of training:
| Method | Difficulty | Need a ROOT/ADB? | It's battery-powered? | Energy consumption |
|---|---|---|---|---|
| Standard settings | ⭐ | ❌ No. | ✅ Yes, up to 30 minutes) | Low. |
| Developer mode | ⭐⭐ | ❌ No. | ❌ Only from charging. | Average. |
| Reading mode | ⭐ | ❌ No. | ✅ Yes (in selected applications) | Low. |
| Third-party annexes | ⭐⭐ | ❌ No (⚠️ certain functions) | ✅ Yes. | High. |
| ADB-team | ⭐⭐⭐ | ✅ Yes (ADB) | ✅ Yes. | Average. |
For most Redmi users 9T The best solution is a combination of standard settings (increase the timeout to 10 minutes) and reading mode for specific applications. If you need to constantly turn on the screen (for example, for a navigator in a car), it is better to use the device. ADB-command or application Keep Screen On with connection to charging.
Frequent problems and solutions
Even after one of the methods is used, the Redmi 9T screen can continue to go out.
- 🔋 Energy-saving regime: MIUI It can ignore the timeout settings if you're in Ultra-Economic or Battery mode. Turn it off in Settings. → Battery and productivity → Battery mode.
- 📱 Application optimization: The system can force background programs to "sleep"; add the desired application to the exceptions (Settings) → Battery → Optimizing the battery → All applications).
- 🔄 Resetting settings: If after updating MIUI Timeout reset, check the settings again – sometimes firmware returns default values.
- 🛠️ Problems with the proximity sensor: On Redmi 9T A faulty sensor can falsely detect "approach" (for example, in a pocket) and turn off the screen. | grep -i "proximity If the values do not change when you raise your hand, the sensor is defective (repair required).
⚠️ Attention: on some firmware MIUI region EEA (Europe) Developer mode functionality may be limited. If you can't find Sleep when you connect to charging, try changing the firmware region through Settings. → Additionally. → Region (at your own risk!).