Comment 13 for bug 1426115

u-s-c change available in silo 30
based on conversation with alf, 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 [1] 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.