u-s-c change available in silo 30
based on conversation with alf, see comment above, this bug won't be closed 
based on the u-s-c changes alone.
We need components to employ this change in order to get the benefit

excerpt from alf mail

What's missing
--------------

* Other components that emit notifications and turn the screen on need
  to use reason 'notification' (integer value 4) to take advantage of
  the reduced timeout and proximity behavior.

* Phone calls display an accept/reject prompt, but proximity is not
  enabled for this prompt, so one could inadvertently reply to a phone
  call (although it requires a slide gesture, which makes it more
  difficult). I have an MP 
https://code.launchpad.net/~afrantzis/powerd/phone-call-notification-enable-proximity
 that tries to improve this in powerd,
  but has a few drawbacks:

  - If the proximity sensor is covered when a phone call is received,
    the screen turns on momentarily before turning off again.
  - If the screen is already on, proximity is still enabled.

  For SMS messages we avoid these issues by handling everything inside
  USC. We could go the same way here by introducing a new reason 'call'
  for turning the screen on. I would recommend against this though,
  since we would be adding even more complexity and inelegance to a
  system that's already broken design-wise.

** Changed in: telepathy-ofono (Ubuntu)
       Status: Invalid => New

** Changed in: canonical-devices-system-image
       Status: Fix Committed => In Progress

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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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