Xiaomi Redmi 9C screen turns off too quickly, interrupting reading, watching videos or playing? This is a standard MIUI power saving feature, but it is easy to turn off - both temporarily and permanently. In this article, we will analyze all possible ways, including hidden settings, third-party applications and even teams for developers.
The problem is relevant not only for the Redmi 9C, but also for other Xiaomi smartphones based on MIUI 12-14. However, in this model, due to the budget hardware (Helio G35, 2/3 GB of RAM), auto-turning the screen sometimes works incorrectly - for example, during charging or when connecting via USB. We tested each method on the firmware MIUI 12.5-14, so the instructions will work independently of the software version.
If you need to turn off the timeout once (for example, for a long time viewing a recipe in the kitchen), you will have enough standard settings. For a permanent solution, you will need to dig deeper, up to and including the need to do a lot of research. ADB-But don't worry, even without root rights, all methods are safe and reversible.
⚠️ Important: Long-lasting screen life without turning off reduces battery life. at Redmi 9C with a battery of 5000 mAh is not critical, but when using actively (games, navigator) it is better to keep the device on charge.
1. MIUI Standard settings: Maximum timeout
The easiest way is to increase the time to automatically turn off the screen through the settings menu, which will not remove the function completely, but will stretch the interval to 30 minutes (maximum for MIUI).
How to do this:
- Open the Settings → Screen.
- Select Sleep after inactivity (or screen timeout in newer versions of MIUI).
- Set the value of 30 minutes.
⚠️ Note: Some of the Redmi firmware 9C (especially global) the maximum value can be limited to 10 minutes.
If you need to temporarily turn off auto-turning (for example, for a presentation), use Do Not Disturb:
- Swipe down to open the notification panel.
- Keep your finger on the Do Not Disturb badge.
- Activate the option while using the screen.
Check the current version of MIUI (Settings → About Phone)
Connect your phone to charge (recommended for long-term tests)
Close background applications (swipe up in multitasking)
Take a screenshot of the current screen settings (in case of rollbacks)-->
2.Developer Mode: Hidden Options for Screen Control
MIUI hides a number of useful features behind Developer Mode, including the ability to completely turn off the screen auto-turn off while charging or when using it actively.
How to activate the developer mode:
- Go to Settings. → The phone.
- Tap 7 times on the item MIUI version (you will be notified you became a developer!).
- Back to Settings → Additionally. → For developers.
Now find and enable these options:
- 🔄 Stay active while charging – the screen will not go out while the phone is connected to the network.
- 📱 Do not turn off the screen when touched (could be called Wake Lock) – useful for reading or playing.
- ⚡ Debugging by USB (will be required for methods of ADB below).
⚠️ Note: Stay active while charging may not be available on some versions MIUI for Redmi 9C. In this case, use ADB-Section 4 teams.
Once a week | Only for games |Constantly |Never used-->
3. Special applications: Keep Screen On and analogues
If the system settings don't work, third-party utilities will come to the rescue, and they work on a crutch-like principle: they mimic user activity or block system signals of inactivity.
Top.-3 Proven applications for Xiaomi Redmi 9C:
- 📱 Keep Screen On is a simple toggle in the notification bar. It doesn't require root, but it can conflict with the system. MIUI.
- ⚡ Caffeine - activated through tile in the curtain. Supports exceptions for individual applications.
- 🔄 Stay Alive – advanced settings, including work during charging and at low charge.
How to set up Stay Alive (Recommended for Redmi 9C):
- Download the app from Google Play.
- Open and grant permissions to Overlay over other windows and Ignore battery optimization.
- Turn on options: The screen is always on when charging the screen is always on for selected applications (e.g. YouTube or Chrome).
Important for Redmi. 9C: Apps like Keep Screen On can cause lags on a budget Helio processor G35. If you notice slowdowns, reduce the frequency of the survey in the utility settings or use ADB-method.
Why does MIUI block third-party utilities?
4. ADB-Teams: Complete control without root
For advanced users, the best way is to turn off the screen auto-turndown via Android Debug Bridge (ADB). It does not require root rights, but it does require a computer and USB-cable.
Step-by-step:
- Download ADB Tools for Windows/macOS/Linux.
- Enable USB debugging on your phone (see section 2).
- Connect Redmi 9C to your PC and enter Adb devices in the terminal (should appear serial numbered device).
- Use the command to turn off timeout: adb shell settings put global stay_on_while_plugged_in 3 (where 3 — The screen is always on when charging from the network and USB).
Other useful ADB-team 9C:
| Team team. | The effect |
|---|---|
| adb shell settings put global stay_on_while_plugged_in 1 | The screen is only on when charging from the network (not from USB) |
| adb shell settings put system screen_off_timeout 1800000 | Set timeout 30 minutes (value in milliseconds) |
| adb shell dumpsys power | Shows current food settings (for diagnosis) |
⚠️ Note: After restarting the phone ADB-To make the changes permanent, use the task in Automate or Tasker to automatically apply the commands when you start the system.
1. Reinstall Xiaomi drivers on PC.
2. Use the original USB-cable (not all cables support data transmission).
3. Enable the debugging option in the developer settings USB (security parameters and confirm RSA-key.-->
5. Settings for individual applications
MIUI allows you to flexibly set the screen to auto-turn for specific programs.This is useful if you need to keep the screen from going off only in YouTube, Chrome or games.
How to set up exceptions:
- Open Settings → Applications → Application Management.
- Select the application you want (such as Google Maps).
- Slip the battery. → Battery consumption management.
- Choose No Limits.
- Go back and turn on AutoRun and Secondary Start.
⚠️ Attention: On Redmi 9C With 2GB of RAM, some games (such as Genshin Impact) can force the screen to go out due to overheating, in which case only external cooling or lowering graphics settings will help.
💡
Setting up for individual applications is the safest method, as it does not affect system parameters, but it does not work with all programs (for example, system utilities like Camera or Gallery ignore these exceptions).
Alternative methods: from USB-debugging to physical triggers
If none of these things worked, try out-of-the-box solutions. They're less convenient, but sometimes they save you in critical situations.
Method 1: Use of the USB-debugging
Connect your phone to your PC and send periodic commands to “cheat” the system:
adb shell input tap 500 500(emulates touching 500x500 every N seconds) Use Python or AutoHotkey script to automate.
Method 2: Physical locking of the proximity sensor
On the Redmi. 9C The proximity sensor is located to the right of the speaker, and if you put opaque tape on it, the system will "think" that the phone is pressed to the ear (as in a call), and the screen will not go out. ⚠️ Disadvantage: turn off gestures and automatic brightness adjustment.
Method 3: Starting a Hidden Demonstration Mode
MIUI has a hidden Demo Mode that turns off the screen timeout (designed for stores) and is activated by the team:
adb shell am start -n com.android.settings/.DevelopmentSettingsThen turn on Demo Mode in the developer settings.
Method 4: Using Tasker for Automatic Control
Create a task in Tasker that will:
- Turn off timeout when you start selected applications.
- Return the settings back after closing.
Example of conditions: App → YouTube → Enable Display Timeout → 1 hour.