The proximity sensor of yours Xiaomi, Redmi or Poco smartphone does it work badly? During calls, does it happen that the screen turns on again, making you press random things? or while listening to a voice message does the audio keep disappearing and coming back? Unfortunately it is “normal”. More and more on Xiaomi-branded smartphones, therefore also including Redmi and Poco, it happens that the proximity sensor used to turn the screen off and on again when we bring it to the ear works very badly so it does not trivially perform what it is designed for, that is, avoid pressing random things on the screen to the cheek during calls or voice messages. In this in-depth analysis we explain why and what to do to solve, or at least try.
Because the proximity sensor works poorly on Xiaomi, Redmi and Poco
The reason is very simple: there is no proximity sensor. In fact, for a choice that has not yet been clarified, the Chinese manufacturer has decided to actually supplant the optical proximity sensor with an ultrasonic mechanism. The operation is simple: an acoustic signal is sent from the ear capsule which is then picked up by the secondary microphone placed on the upper frame. If this sound arrives in less time than usual or with greater intensity, probably the ultrasound signal has bounced against something (our cheek or ear) thus indicating the smartphone to turn off the screen. All this is then activated by the gyroscope which is a sensor used to understand the movements we make with the smartphone, such as the gesture of bringing it to the ear.
This system, however, decidedly complicated compared to a simple optical sensor that measures the distance from the subject, is decidedly fallacious and very often it happens that the smartphone does not understand that it is in contact with our face by waking up the screen. This almost always causes some problems like putting a call on hold, or enter the settings and activate functions at random or change options in the settings. In short, unpleasant things that waste time and the desire to make phone calls.
How to check the proximity sensor problem on Xiaomi, Redmi and Poco smartphones
A first step we can take is verify its effective functioning, to do this there is a hidden function on smartphones that can be called up through the settings menu. It’s enough
- open the Settings menu and click on System Info, then on All specifications;
- locate the entry “kernel” and press many times until you go to another screen that is the Control Information Toolbox;
- in this menu now you have to scroll down and look for “Proximity Sensor”, click it;
- with this function it is possible to check operation simply by placing a hand on the upper part of the screen;
- the value 5 indicates that the sensor is not occluded, the value 0 instead indicates the state of occlusion, if approaching and moving away the hand the value changes then the operation is correct, otherwise it is not.
On some smartphones there is now an additional button that allows you to recalibrate the proximity sensor, on many others, however, nothing is present therefore you will have to proceed with the next step.
How to (try to) fix the proximity sensor problem
What we propose is a solution that does not always work therefore the advice is to try otherwise you will not be able to do anything but bear the problem or change your smartphone.
The method consists in downloading and installing an application available for free on the Google Play Store called Proximity Sensor Reset (available at this link). Once opened we must:
- click on the button Fix It;
- do what it asks us on the screen, that is: occlude the proximity sensor, or bring the smartphone to your ear, and press forward once the light turns green;
- remove the smartphone from your face and press Next again when the light turns green;
- confirm and enable background execution.
Once this is done, the smartphone will use the recalibration to activate or turn off the display during calls or voice messages, however the method of operation will not change and therefore the situation could improve but difficult to resolve completely.
As mentioned, the only alternative left to you at this point, if you have not solved it, is to endure and pay attention during calls, or use a pair of True Wireless headphones or wired headphones.