Proximity sensor is oversensitive (was "Screen blanks when making call")

[treebeard]

I had a similar issue, caused by the proximity sensor.
Can you please check what

Code:

grep . /sys/bus/iio/devices/iio\:device*/in_proximity_{nearlevel,raw}

provides.
In my case it helped to peel of the screen protector (before raw was always above 25, whereas 15 and above indicate "phone is placed near the ear -- blank screen").

I forgot about the proximity sensor!

$ grep . /sys/bus/iio/devices/iio\:device*/in_proximity_{nearlevel,raw}
/sys/bus/iio/devices/iio:device0/in_proximity_nearlevel:15
/sys/bus/iio/devices/iio:device0/in_proximity_raw:17

That's with the phone face-up on a desk and me a couple feet away.  If I put my hand over the phone at varying distances the raw value ranged from 19 to 408.  I hate to lose the screen protector.  I tried echoing a new value into in_proximity_nearlevel but kept getting "permssion denied" so I'm searching for info on tweaking that.