[Q&A] Screen stays dark after answering a call, problems with proximity sensor

This happens sometimes when fresh installing a custom ROM. If your proximity sensor seems not to work, try the following:

1. Blow pressurized air into the front speaker (proximity sensor sits right beside it and dirt could sneak in that way)

2. If 1 does not help, try "Proximity Fix" from Play Store and reboot.

3. If 1 and 2 don't help, open a terminal app like "Terminal Emulator", grant it super user rights and type

$ echo 0 > /sys/devices/virtual/sensors/proximity_sensor/prox_cal
$ echo 1 > /sys/devices/virtual/sensors/proximity_sensor/prox_cal
$ chown system:system /efs/prox_cal
$ chmod 644 /efs/prox_cal
$ sync

and reboot.
Source for 3:
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