The latest instance of this was my phone locked after too many unlock attempts 
while in my pocket making it quite inconvenient to take a picture.
Contrary to my comment #6 I can trigger touch events through lightweight fabric 
like pocket lining.
I disagree with point 1 in comment #9, If you can see the screen the proximity 
sensor will be disengaged. If you can't it should prevent the screen from 
coming on. That is:
Event happens - proximity is true - screen off
user takes phone from pocket - proximity now false - screen comes on unless 
timeout period has passed

I think all the issues with inadvertent touches are resolved by fixing
this to keep the screen off until proximity is not detected.

Also see bug #1426115 to shorten the time the screen is on when
triggered by an event

** Changed in: canonical-devices-system-image
    Milestone: ww24-2015 => ww28-2015

** Changed in: canonical-devices-system-image
       Status: Incomplete => Confirmed

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https://bugs.launchpad.net/bugs/1291455

Title:
  [greeter] Screen and input should be disabled with proximity sensor
  when on greeter

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