Xiaomi Redmi 9T automatically goes out after 30 seconds of inactivity? This is the standard MIUI power saving feature that annoys you when reading long articles, viewing recipes or using your smartphone as a navigator. You can turn off screen attenuation in several ways, from basic settings to hidden commands for developers. But it is important to understand that the constant operation of the display reduces battery life by 15-25% (according to the GSMArena tests for Redmi 9T with a battery capacity of 6000 mAh).
In this article, we will discuss 5 proven methods of turning off screen timeouts, including official and alternative (via ADB, kipper apps).We will also discuss why MIUI limits the minimum attenuation time to 15 seconds in some firmware, and how to circumvent this limitation.Spoiler: on versions of MIUI 14+, only the method will work through ADB or third-party software - the standard settings are cut down there.
If you are using Redmi 9T how GPS-If you're in a car or for presentations, it's critical to keep the screen on, but remember, even when you're in "Always on display" mode" (AOD) The smartphone will consume ~1% charge per hour (according to DXOMark's lab for Xiaomi low-end devices) Ready to sacrifice autonomy for convenience.
1. Standard method: screen settings in MIUI
The easiest method is to use built-in system options. It is suitable for most versions of MIUI (12, 13, 14), but has a limitation: the minimum attenuation time is 15 seconds. If you need to turn off the timeout completely, move to the next sections.
Instructions:
- Open the Settings app (cog icon).
- Go to the Display section.
- Select Sleep Mode (or Screen Attenuation in new versions).
- Set the maximum value of 10 minutes (or 30 minutes if available).
On some Redmi 9T firmware (e.g. global MIUI 13.0.6), the option may be called Timeout or hidden in the submenu Additional.If you don't have Sleep Mode, upgrade to the latest version or use alternative methods.
2. Developer Mode: Hidden Timeout Settings
MIUI has a hidden developer mode that allows you to change system settings that are not available in the standard interface, which can set the screen attenuation for 500 seconds (8+ minutes) or turn it off altogether (on some firmware).
How to activate the developer mode:
- Go to Settings. → The phone.
- Find the MIUI version string and tap it 7 times in a row.
- Enter your password/pattern lock if you receive a request.
- Return to the main settings menu – there will be a new section for developers.
Now turn off the attenuation:
- Go to Settings. → For developers.
- Scroll down to the Display block.
- Find the Sleep mode option when connecting to charge and turn it on (this will turn off the timeout if the phone is charging).
- To completely disable, find the screen timeout and set the value Never (if the option is available).
⚠️ Attention: MIUI 14 and newer option Never may be absent. In this case, use the method with ADB (section 4) or third-party annexes.
☑️ Preparation for changing the developer’s settings
3.Kipper apps: Keep Screen On and analogues
If the system's methods don't work, third-party tools will come to the rescue. Apps like Keep Screen On or Caffeine mimic user activity, keeping the screen from going out, plus they don't require root rights, but they can conflict with MIUI optimization.
The best apps for Redmi 9T:
- 🔹 Keep Screen On is a simple kipper with a widget for quick on/off. Works through notification.
- 🔹 Caffeine – allows you to set an activity timer (for example, keep the screen on for 1 hour).
- 🔹 Stay Alive – Supports exceptions for individual apps (e.g., Google Maps only).
- 🔹 Tasker is for advanced users, and you can create a rule: If you run X, → shut off".
How to set up Keep Screen On:
- Download the app from Google Play.
- Open it and grant permission to Overlay over other windows (in the security settings).
- Activate the Keep Screen On switch.
- Add the widget to the main screen for quick control.
⚠️ Attention: MIUI aggressively optimizes background processes. If the kipper stops working, add it to Autostart and Unlimited through Settings → Annexes → Permits → Special access.
| Annex | Requires root. | It's working on MIUI 14. | Battery consumption |
|---|---|---|---|
| Keep Screen On | ❌ No. | ✅ Yes. | ~2–3% per hour |
| Caffeine | ❌ No. | ✅ Yes. | ~1–2% per hour |
| Stay Alive | ❌ No. | ⚠️ Partially (requires settings) | ~3% per hour |
| Tasker | ❌ No. | ✅ Yes. | Depends on the rules. |
4. ADB-Teams: Turning off timeout without root
If none of the previous methods worked, it remains. ADB (Android Debug Bridge. It's a debugging tool that lets you change system settings through a computer. It works on all versions. MIUI, requires USB-debugging.
Step-by-step:
- Download ADB Tools on PC.
- Turn it on. USB-Debugging on the phone: Go to Settings → For developers, activate the debugging switch. USB.
Redmi 9T
File transfer
ADB
adb devicesThe serial number of the device should appear.
adb shell settings put global stay_on_while_plugged_in 3Transcript:
3
To return the standard settings, use:
adb shell settings put global stay_on_while_plugged_in 0What if the ADB can’t see the device?
💡
ADB-The only reliable way to disable the attenuation MIUI 14+, where standard settings are cut.
5. Set up exceptions for individual applications
If you want your screen to stay on-screen only in specific programs (like Google Maps or Waze), use the built-in MIUI feature or third-party utilities.
Method 1: via MIUI settings (not available on all firmware):
- Open Settings → Applications → Application Management.
- Select the appropriate app (e.g. YouTube).
- Slip on Permissions → Additional → Autoturn and Sleeping Mode.
- Turn on the option to not turn off the screen.
Method 2: Stay Alive (for all versions of MIUI):
- Download Stay Alive from Google Play.
- Go to the Appendix section.
- Add the required programs to the list of exceptions.
- Turn on the option to keep the screen on.
On custom firmware (for example, LineageOS) the restriction can be removed completely, but this requires unlocking the bootloader and losing the warranty.