The situation when the display of Xiaomi smartphone goes out at the most inopportune moment, familiar to many users. You read an article or watch a video, and suddenly the screen turns off, blocking access to content. It is not just an annoyance, but a potential signal of software failures or sensors malfunction. Most often the problem lies in the settings of the sleep timer, but in the shell of MIUI there are nuances that not everyone knows about.
Device owners often confuse automatic locking with proximity sensors. If the screen goes out when you hold your phone to your ear while you're ringing, that's normal. But if the dimming happens randomly when you read or navigate, you need to intervene. It's important to understand that energy saving algorithms can aggressively limit the display to be unused.
In this article, we'll look at all the possible causes, from trivial time settings to complex hardware conflicts, learn how to calibrate sensors correctly, turn off "smart" functions that interfere with comfort, and identify hidden firmware bugs. The main cause of sudden quenching is 80% of the time a light sensor calibration failure, not a physical matrix failure.
The first thing you need to check is the standard time settings before going to sleep. MIUI The path to these may vary slightly depending on the Android version, but the logic remains the same. Go to the Settings menu and find the Screen and Brightness (or just the Screen) section. This is where the slider or the time selection list is located. 15 seconds to 10 minutes or "Don't turn off." If you set a 15 or 30 second setting, the screen will go out very quickly if you don't touch it. It's recommended that you set a minimum of 2 minutes for comfortable reading. However, remember that the “Do not turn off” mode can cause the matrix to burn out. OLED-Sometimes the user changes these settings, but the system does not save the changes due to a software glitch. In this case, it helps to simply restart the device, and it is also worth checking whether the Pocket Mode mode or similar functions in the “Screen Lock” section are activated, which can force the display to be extinguished when placing the phone in the bag. 📱 Go to Settings. → Screen and brightness → Sleeping and choosing a comfortable time. 🔄 Perform a full smartphone reboot if the settings are not saved after the selection. 🔋 Check if the “Energy Savings” mode is activated, which may ignore your timer settings. 📊 How often do you go out?Only when reading / Constant / Only in your pocket / Never, everything works
If the screen goes out randomly, rather than by the timer, it's probably the proximity sensor that's at the top of the body, often next to the speaker, and it's designed to turn the screen off during a conversation so that you don't cheek-drop calls. However, contamination, a security glass or software glitch can make the sensor think the phone is constantly in the ear.In Xiaomi devices with frameless screens, a virtual sensor is used, working on the basis of ultrasound or image analysis from the front camera. These systems are sensitive to contamination and cover covering the top of the screen, and if you notice that the screen goes out when you just hold the phone in your hand, try to wipe the top of the case. MIUI There's a hidden engineering menu. Call the phone book and dial ##6484##. From the menu that opens, select Proximity Sensor. When you close and open the top of the screen with your hand, watch the readings. If the values do not change or change with a delay, calibration is required. ⚠️ Warning: Do not seal the front camera and top speaker with tight black-framed protective glass, guaranteed to cause false alarms and permanent screen quenching.
Android and MIUI have aggressive power-saving mechanisms. They can force the screen to go out if they think an application running in the background is consuming too much resources or not optimized. This often happens with navigators or applications for reading third-party books. Check the settings of a particular application. Go to Settings → Applications → All applications, select a problematic application and find the energy point No limits. This will prevent the system from "strangling" background processes and extinguishing the screen during the time "anding the algorithm is too bright to pay attention to the environment." Disabling auto-brightness often solves the problem of instability behavior of the display. Parameter Recommended value Effect on the screen of the sleep timer 2 minutes Prevents fast blocking when reading Auto-brightness Disabling (manual) Removes jumps and false quenching Pocket Mode Disabling Excludes quenching in the bag without pressing Background Limitation No restrictions Does not allow the system to close the application
Specific functions MIUI Xiaomi owners are faced with unique shell features that can conflict with normal use, such as the one-handed function or special gestures for screenshots sometimes intercept control and extinguish the display. Also worth checking is the Read Mode settings, which mimics paper and can change the backlight behavior. Pay special attention to lock settings. → Screen locking can be active functions like “Raise to wake up” or “Double touch to turn on.” If the touch layer has defects, these features may not work properly, creating the illusion that the screen goes out on its own, even though it simply cannot properly handle the touch to turn on.