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this answer mentions calibrating the proximity sensor (not sure if that's available on all devices - the post was about a Yureka); but same answer here for a Micromax, so it might be worth checking. Other probable causes: sensor dirty (clean it), or you use a cover which is, ahem, covering the sensor?Xiaomi. Redmi Note 8 Pro. Redmi Note 8 Pro Questions & Answers. Search This thread Member. Nov 11, 2014 8 0. Nov 14, 2019 #1 Proximity sensor of my note 8 pro not working at all. During calls display turns off and doesn't turn on till the call ends. Cpuz and CIT test show 0.0 reading which doesn't change no matter what i do. Why is the Proximity Sensor on Poco M3 and M3 Pro 5G not working? Both Poco M3 and M3 Pro 5G don't use an optical proximity sensor or an actual physical sensor. Instead, Xiaomi sources its digital mock-up from a company called Elliptic Labs which allows it to mimic the operations of a physical proximity sensor without actually integrating one hL1k.