How to disable the proximity sensor on Android 8: Complete guide

The problem of the screen suddenly blanking during a call is one of the most annoying scenarios for using a smartphone based on the operating system Android. This is especially often encountered by users of devices running version Android 8 Oreo, where the algorithms for managing energy consumption and sensor modules have undergone significant changes. When the screen goes dark in your pocket or when you bring the phone to your ear at the wrong time, this makes it difficult to manage a call, put it on speakerphone or dial a number through the keyboard.

The reason lies in the work proximity sensor, which is designed to save battery power and prevent accidental pressing with the cheek. However, on many smartphone models, such as Xiaomi, Huawei or Samsung, this mechanism does not work correctly due to software glitches or hardware implementation features. In some cases, standard system settings do not allow you to completely deactivate this sensor, requiring deeper intervention in the operation of the software.

In this material we will analyze in detail all the available ways to solve this problem. You will learn how to use hidden engineering menus, third-party calibration utilities, and even computer debugging methods. It is important to understand that completely disabling the sensor can lead to accidental cheek presses during a call, so it is recommended that you first try calibrating it. We will look at safe configuration paths that do not require root access, as well as more complex options for advanced users.

Why the screen goes blank: principles of sensor operation

The proximity sensor is an infrared emitter and receiver, usually located at the top of the front panel of the smartphone. Its main task is to determine the distance to an object. When you bring the phone to your ear, the sensor detects the reflection of the infrared beam and sends a signal to the system to dim the display. This prevents accidentally switching channels or ending a call with your cheek.

On Android 8 control of this module is often intercepted by system services, which may incorrectly interpret the data. For example, a protective film applied incorrectly or contamination of the speaker area can create a permanent “shadow” for the sensor. As a result, the system thinks that the phone is at the ear all the time and keeps the screen turned off.

There are several main reasons for incorrect operation:

• 📱 Software failure in the sensor drivers after a system update.
• 🛡️ The presence of a thick protective film or cover that covers sensor.
• ⚙️ Incorrect calibration at the factory or after replacing the display.
• 🔋 Aggressive energy saving settings that turn off the sensor ahead of time.

Before taking drastic measures to disable it, it is worth checking the physical condition of the top of the screen. Sometimes simply wiping the area above the speaker or removing the protective glass is enough to resolve the problem on its own. If physical factors are excluded, we move on to software settings.

Using the engineering menu for calibration

One ​​of the most effective ways to correct the operation of the sensor without third-party software is to enter the engineering menu. This is a hidden section of the system intended for testing equipment. On different smartphone models, logging into it is carried out differently, but universal USSD codes or special applications are often used.

For devices based on processors MediaTek and many models Xiaomi the code ##6484## or ##3646633##works. Entering it in the Phone application will take you to the testing menu. Here you need to find the section associated with Hardware Testing or Sensor. Inside this section, the “Proximity Sensor” item is searched.

⚠️ Attention: Be extremely careful in the engineering menu. Changing parameters unknown to you can lead to unstable operation of the radio module or the sound part of the smartphone. Change only the settings related to sensor calibration.

The calibration process usually looks like this:

• 📏 Cover the top of the screen with your palm (conversation emulation).
• 👁️ Remove your hand and make sure that the value changed (usually from 0 to 255 or vice versa).
• 💾 Press the "Calibrate" or "Save" button to record the new thresholds.

If the standard codes do not work, you can use the application Engineer Mode - MTK from the store Google Play. It provides access to the same functions that are hidden by the manufacturer. After calibration, be sure to reboot the device for the changes to take effect. Often it is the reconfiguration of the sensitivity thresholds that solves the problem of false positives better than a complete shutdown.

Using third-party fixing applications

When system settings do not give the desired result, specialized applications from the store come to the rescue. Google Play. They do not physically turn off the sensor, but intercept its signal and block the command to turn off the screen. This is a safe method that does not require deep knowledge of the system.

One ​​of the popular solutions is the application Proximity Sensor Reset/Fix or its analogues, such as Lesser Screen Off. The principle of their operation is to create a transparent layer on top of the desktop, which ignores signals from the proximity sensor. After installing such an application, you must provide it with the appropriate permissions in the accessibility menu.

Algorithm of actions when using third-party software:

1. Download the locking application from a trusted source.
2. Run the app and activate the sensor blocking function.
3. When an incoming call arrives, the screen will appear a floating button or overlay.
4. Tap on the control to force the screen to turn on if it goes dark.

It is important to note that such applications may consume additional battery power as they constantly monitor the status of the sensor. Also, on some shells, for example MIUI or EMUI, the system can aggressively unload such apps from memory. In this case, you need to add the application to the list of battery and startup exceptions.

Setting up via ADB: a method for advanced

For users who are not afraid of the command line and want to gain full control over the system, there is a debugging method via Android Debug Bridge (ADB). This method allows you to change system parameters that are hidden from the average user. You will need a computer, a USB cable and installed drivers for your smartphone.

The first step is to activate developer mode on your phone. To do this, go to Settings → About phone and quickly click on the build number seven times. Then in the menu For developers enable USB debugging. Connect your smartphone to the PC and launch the command line.

Enter the following command to test the connection:

adb devices

If the device is displayed in the list, you can try changing the global sensor settings. However, the Android 8 direct command to turn off the sensor is often blocked. Instead, you can try resetting the sensor or changing its senses. In some cases, the command to reset the calibration works:

adb shell settings put system proximity_sensor_calibrated false

After executing the command, restart the phone. This method does not guarantee 100% results on all firmware, since manufacturers often modify system tables. However, this is a safe way to try to fix a software glitch without installing questionable software.

What to do if ADB does not see the phone?

If the adb devices command does not show the device, check whether the ADB Interface driver is installed in the Windows Device Manager. Also try replacing the USB cable or switching the port. Make sure that a window asking for debugging permission appears on the phone screen, and click "OK".

Comparison of methods for solving the problem

The choice of solution depends on your technical background and smartphone model. Below is a table that will help you decide on the best option. Each method has its own advantages and disadvantages, which should be taken into account before starting manipulations.

Method	Complexity	Efficiency	Risks
Engineering menu	Average	High	Low (if careful)
Third-party applications	Low	Medium	Battery consumption, advertising
ADB commands	High	Medium/High	Medium (input error)
Reset settings	Medium	High	Loss of user data

As can be seen from the table, the safest and easiest way for most users is to use specialized applications. However, if you want to solve the problem systematically and permanently, it is worth spending time mastering the engineering menu. Resetting to factory settings is recommended only as a last resort when other methods have not helped.

Do not forget that software failures can be caused by a conflict of recently installed applications. If the problem appeared recently, try to analyze what software was installed during this period. Removing the conflicting application can restore normal operation of the sensor without additional settings.

Radical measures: resetting and flashing

If none of the above methods helped, the problem may lie in deep file system errors or damaged system files. In this case, there are two options left: a complete data reset (Hard Reset) or flashing the device. Before these steps, be sure to back up all important data.

To perform a reset, go to Settings → Advanced settings → Recovery and reset. Select "Reset settings". The phone will return to its out-of-the-box state and all user data will be erased. This often helps fix software conflicts that have accumulated during use.

⚠️ Attention: After resetting or flashing, all your contacts, photos and applications will be deleted. Make sure that you have an up-to-date copy of the data in the cloud or on your computer before starting the procedure.

In a situation where even a reset does not help, there is a high probability of a hardware failure. The proximity sensor could be physically damaged, or the cable connecting it to the motherboard may have come loose. In such cases, software methods are powerless, and a visit to the service center is required to replace the module or cable.

Frequently asked questions (FAQ)

Can protective glass cause false alarms?

Yes, this is one of the most common reasons. If the glass is not glued smoothly, has thick edges or is of poor quality, it may block the IR port of the sensor. Try removing the glass and checking the phone's operation without it.

Does the power saving mode affect the sensor?

Q Android 8 Power saving modes can limit the background activity of the sensors to save battery. Try disabling the "Energy Saving" mode and check whether the screen behavior changes during a call.

Do you need root access to disable the sensor?

For most of the described methods (engineering menu, applications), superuser rights are not required. However, for deep modification of the system files responsible for the sensor drivers, Root access may be necessary, but this increases the risk of turning the phone into a “brick.”

Why did the sensor stop working after replacing the screen?

When replacing the display, low-quality components are often used, in which the proximity sensor is missing or incorrectly located. Also, the technician might have forgotten to connect the cable or damaged it during assembly. Re-diagnosis at the service is required.