Xiaomi 2 32G version. Why is there no sound when I lock the screen and unlock it now? Settings and all sounds are the loudest! Also turned on the lock screen vibration sound.

Hello, there may be some applications in your system that interfere with the normal operation of the system, especially some programs that get root permission. For the security of the mobile phone system, please don't use root permission at will. It is recommended that you back up your data, enter recovery to clear all data (turn off your phone, press and hold the volume up+power on button to enter recovery), upgrade your phone to the newly developed system with a wire brush, and don't install the application that requires root permission for the time being to see if it can be restored to normal.

I hope the above reply can help you.