Xiaomi Redmi 9 Pro automatically goes out after 30 seconds of inactivity? This is standard MIUI behavior designed to save battery life. But in some situations — while reading long articles, going through levels in games or watching presentations — constantly turning on the screen is annoying. Fortunately, there are several ways to turn off auto-switching, from basic settings to hidden features for power users.
In this article, you will find 5 proven methods, including settings through the phone menu, using developer mode and third-party applications. We will also discuss why the screen can go out even after the timeout is turned off, and what to do if the settings are reset after the restart. All instructions are relevant for the Redmi 9 Pro based on MIUI 12-14 (including global and Chinese versions of firmware).
1. Standard screen settings in MIUI
The easiest way to increase the time to auto-turn off the screen is to change the settings in the settings menu, which does not require root rights or special knowledge, but has a limit: the maximum inactivity time in MIUI by default is 10 minutes.
To change the timeout:
- Open the Settings app (cog icon).
- Go to the Screen section.
- Select Sleep Mode (or Auto-Switch Off screen in some versions of MIUI).
- Set the desired time: from 15 seconds to 10 minutes.
If your phone does not have a Sleep mode, check the MIUI version:
- 🔍 Go to Settings. → The phone. → Version. MIUI.
- 📱 On old firmware (below) MIUI (11) the path may be different: Settings → Battery and productivity → Battery management → Settings → Sleeping mode.
- ⚙️ In global firmware versions, the item is sometimes called Screen timeout (in English).
💡
If your settings have reset after the MIUI update, try clearing the Settings app cache through Settings → Apps → App Management → Settings → Clear the cache.
Limitation of method: even if you choose 10 minutes, the screen will still go out if the phone is lying on the table without movement.
2. Developer mode: hidden opportunities
Redmi 9 Pro has a hidden mode for developers that allows you to turn off the auto-turn off the screen completely, which works on all versions of MIUI, but requires pre-activation mode.
How to turn on the developer mode:
- Go to Settings. → The phone.
- Find the MIUI version and tap it 7 times in a row.
- You will be notified: You have become a developer.
Now turn off the auto-turnoff:
- Return to the main settings menu.
- Open the Additional (or Advanced Settings) section.
- Choose Developer's.
- Scroll down and find the option to Turn off the automatic screen (or Stay awake).
- Activate the switch.
Important: Once this option is activated, the screen will not go out when connected to the charger, but may continue to turn off when running from the battery.
- 🔌 In the same menu for developers find Do not turn off the screen while charging and turn it on.
- 📱 To work from the battery, use the applications from section 4.
Developer mode is activated (7 taps according to MIUI)
Stay awake or Turn off automatic screen shutdown
Checked the behavior of the screen when charging and from the battery
Limits are set for saving charge (if necessary)-->
3. Battery saving settings and exceptions for applications
Often the screen goes out due to aggressive battery optimization in MIUI. The system can force applications to sleep even if you actively use them. To avoid this, add the desired programs to the list of exceptions.
How to disable optimization for individual applications:
- Go to Settings → Battery and Performance → Application Power Management.
- Select Apps (or App Battery Saver)
- Find the app you want to turn off auto-turning (like YouTube or Chrome) in the list.
- Choose a mode for it without restrictions.
Also check the adaptive brightness settings:
- 🌞 B Settings → Screen. → Adaptive brightness turn off automatic adjustment.
- 🔄 Sometimes the system reduces the brightness to a minimum before turning off the screen – this can be turned off in the same menu.
Always, especially when reading.
Only in games.
Rarely, but annoying.
It's not a problem.-->
Warning: adding too many applications to exceptions can reduce battery life by 15-20%, leaving 2-3 of the most important programs on the list.
4. Third-party screen control applications
If standard methods don't work, you can use specialized utilities that allow you to:
- 🕒 Set an arbitrary time before turning off the screen (for example, 30 minutes).
- 🎮 Turn off auto-turn off only for certain applications (games, video players).
- 🔄 Automatically turn on the screen when receiving notifications.
Top.-3 Proven applications for Redmi 9 Pro:
| Annex | Functions | Needs root? | Reference |
|---|---|---|---|
| Keep Screen On | Keeps the screen on while the app is active, supports list exceptions. | No. | Google Play |
| Caffeine | Adds a button to the notification panel for quick on/off mode "do not sleep". | No. | Google Play |
| Tasker | Allows you to create automatic rules (for example, do not turn off the screen when you start Netflix). | For extended functions | Google Play |
How to set up Keep Screen On:
- Install the app from Google Play.
- Open it and grant permission to Overlay over other windows.
- In the main menu, select the apps you want to turn off auto-turn off (such as Chrome or VLC).
- Activate the switch on.
What to do if the application does not work?
Note: Some applications (e.g. Tasker) may conflict with MIUI system services. If you have lags or your phone starts to overheat after installation, uninstall the program and use other methods.
5. ADB commands for power users
If you're ready to experiment, you can turn off the auto-turning of the screen via ADB (Android Debug Bridge), a technique that requires a computer and basic command-line knowledge, but gives you maximum control over the system.
Step-by-step:
- Download and install ADB Tools on your computer.
- On your phone, turn on USB debugging in the Developer Menu.
- Connect Redmi 9 Pro to PC via USB-cable (select File Transfer Mode).
- Open the command line (Windows) or terminal (macOS/Linux) and type:
adb devicesIf the device is determined, execute the command to turn off auto-switch:
adb shell settings put global stay_on_while_plugged_in 3Where 3 means:
- 0 - off.
- 1 - only when charging from the network.
- 3 – when charging from the network and USB.
To return the standard settings, do:
adb shell settings put global stay_on_while_plugged_in 0💡
ADB commands are valid until the next phone restart, and to make the changes permanent, you need root rights or custom firmware installation.
Warning: improper use of ADB can cause phone malfunctions. Do not follow commands unless you are sure of their purpose - especially those requiring superuser rights (su).
6.Problems and Solutions: Why the Screen Dims Despite the Settings
Even after the auto-switch is turned off, the Redmi 9 Pro screen may go out for the following reasons:
| Problem. | Reason. | Decision |
|---|---|---|
| The screen goes out in 1-2 seconds. | The proximity sensor (for example, during a call) was activated | Check the case or the film, they can block the sensor. Calibrate the sensor using ##6484## (input as a phone number). |
| Settings are reset after rebooting | MIUI resets user settings when updating | Use it. ADB-commands (section 5) or applications with auto-run (e.g., Tasker). |
| The screen does not respond to touch, but does not go out. | Sensor freeze due to overheating or firmware error | Reboot your phone. If the problem recurs, check the temperature of the processor in Settings → About Phone → Status. |
If none of the methods worked, check:
- 🔋 Battery condition: with severe wear (more than 500 charging cycles) MIUI Forced to turn off the screen to save energy. Check the battery health in ##4636## → Battery information.
- 🛠️ System Updates: In Some Versions MIUI There are bugs with screen control. Update the firmware through Settings. → The phone. → Updating the system.
- 📱 Hardware malfunctions: If the screen goes out immediately after switching on or flickers, this may indicate problems with the plume or matrix.