The Xiaomi Redmi 9 screen automatically goes out after 30 seconds of inactivity — a standard MIUI setting that saves battery power but often interferes with reading, watching videos or playing games. If you're tired of constantly touching the screen so it doesn't turn off, there are several ways to undo this restriction. Depending on the task, you can use both built-in MIUI features and third-party apps.
It's important to understand that completely turning off the screen timeout reduces battery life by 15 to 30 percent, but in some scenarios -- for example, using Redmi 9 as a navigator, e-book or media player -- this is justified. Next, we'll look at all the methods available, from basic settings to hidden features for power users.
1. Standard MIUI settings: change in latency
The easiest way to increase the time to auto-turn off the screen is through the settings menu. In MIUI 12/13/14 (depending on the firmware version of your Redmi 9), the path may be slightly different, but the logic remains the same.
Open Settings → Display → Sleep mode (or Screen Lock → Sleep mode in some versions). Here you will see the timeout options: from 15 seconds to 30 minutes. Choose a maximum value of 30 minutes. Note that even this option does not cancel the auto-shutdown completely, but only postpones it.
- ⏱️ 15 seconds – minimum value, suitable for battery saving.
- 📱 30 seconds is the default standard value.
- 🎬 5–30 minutes – optimal for watching video or games.
⚠️ Note: If your Redmi 9 does not have a "Sleep Mode" option, check the version. MIUI. In the firmware for the global market (Global) ROM) It can be called Screen Timeout or hidden in the section.
2. Developer Mode: Turning off the timeout completely
To completely disable the auto-shutdown, you will need to activate the developer mode, which works on all versions of MIUI, but requires caution - incorrect settings can affect the stability of the system.
First, turn on the developer mode:
- Go to Settings. → The phone.
- Find the MIUI version and tap it 7 times in a row.
- The message will be “You are a developer!”
Now go back to the main settings menu, open Additional → Developer For (or System → Additional → Developers) scroll down to the Display section and find the option Sleep mode when you connect to charging. Here you can select "Never" to keep the screen from going out when charging. To completely turn off the timeout (even without charging), use the ADB command (more on this below).
Activate the mode (7 taps according to MIUI)
Find the section "For developers" in the settings
Turn off "Sleeping mode when connected to charging"
Reboot your phone to apply changes-->
3.Using ADB: The Most Reliable Method
If the previous methods do not work, you can turn off the auto-turning of the screen via ADB (Android Debug Bridge), which requires connecting Redmi 9 to the computer, but gives maximum control.
Be prepared first:
- Install. ADB-PC drivers.
- Enable USB debugging in the developer settings (see previous section).
- Connect Redmi 9 to your computer and confirm your debugging permission.
Now run the command in the terminal (or Windows command line):
adb shell settings put global stay_on_while_plugged_in 3This command will keep the screen on whenever you connect to a charger, and to return the standard behavior, use:
adb shell settings put global stay_on_while_plugged_in 0| ADB Team Team | The effect |
|---|---|
| stay_on_while_plugged_in 3 | The screen is always on when charging (USB/wireless) |
| stay_on_while_plugged_in 1 | Only when connected to the socket (not via USB) |
| stay_on_while_plugged_in 0 | Standard Behavior (Time Out Works) |
⚠️ Attention: After use ADB-In rare cases on Redmi 9, this can cause crashes when making phone calls (the screen will not go out in the ear).
4. Third-party apps: Keep Screen On and analogues
If you don't want to dig into the settings, you can install an app from Google Play.
- 📱 Keep Screen On – Turns on the screen when you run selected apps (e.g. YouTube or Chrome).
- 🔄 Caffeine – Adds a Notification Panel for Quick Timeout Management.
- 🎮 Game Booster (built-in to the game) MIUI) — Automatically disables sleep in games.
Example of Keep Screen On settings:
- Install the application and open it.
- Select apps that need to turn off timeouts (like Waze or Google Maps).
- Activate the service in the special features settings (Settings → Special. features → Keep Screen On).
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If the application does not work, check the permissions for "Screen Overlay" in the MIUI security settings. Without this, the function can be blocked.
5. Hidden MIUI features: Mode of cinema and reading
MIUI has built-in modes that indirectly affect the screen, for example, Read Mode (in Settings → Display) not only changes the color temperature, but can also prolong the display activity time when using certain applications (for example, Google Play Books or Moon+ Reader).
Another option is Mode of the Mode (not available on all firmware), which automatically disables sleep mode when playing videos in supported applications (YouTube, MX Player, etc.) to activate it:
- Open Settings → Sound and vibration → Mode of the cinema.
- Turn on the option and add the desired applications to the list.
How to check if the cinema is working?
6.Problems and Solutions: Why the Screen Dims Despite the Settings
Sometimes, even after all the settings, the Redmi 9 screen keeps turning off.
- 🔋 Battery Savings: Ultra-Savings or Charge Savings enabled may ignore the timeout settings. Turn it off in Settings → Battery.
- 🛠️ System failure: Restart the phone. If the problem persists, reset the display settings (Settings) → System system → Resetting settings → Reset the display settings).
- 📲 Update MIUI: After the major firmware updates, the settings can be reset. check the version in Settings → The phone.
A critical feature of Redmi 9 is that on some firmware (e.g. MIUI 12.5 for the Indian market), the Sleep Mode option may not be on the developer menu, in which case the only reliable way is to use ADB or third-party apps.
Alternative methods: physical solutions
If the software methods do not help, you can use physical "crutches":
- 🔌 Constant charging: Connect your phone to a power source – many settings (e.g, ADB-team stay_on_while_plugged_in) They only work in this case.
- 🤖 Automation with Tasker: Create a task that simulates touching the screen every 20 seconds (requires root or scalp). ADB-permitting).
- 📱 External Display: Connect Redmi 9 to HDMI to the monitor (via adapter) USB-C → HDMI) — On the outside screen, the timeout may not work.
⚠️ Attention: Constant touching of the screen (even software) accelerates wear of the matrix. OLED-Redmi 9 displays can cause pixels to burn out with prolonged use.
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The most universal method is a combination ADB-charger + Keep Screen On app for battery-powered operation.