Originally Posted by 9000

I've seen in other threads with similar problems. There're two things that might affect the sensitivity of the sensor:

1) the screen protector that blocks the sensor
2) a magnet near where you store your N900 (e.g. pouch, purse)

You may run the following command to test the sensitivity of the proximity sensor (CTRL-C to break)

Code:

while true; do cat /sys/devices/platform/gpio-switch/proximity/state; done

'open' means nothing in front of the sensor, 'close' otherwise.

Hope this helps.