I can reproduce this.

Start with screen blanked.
Cover top of phone with something., so it covers the proximity sensor.
Call that phone from another one.
While it is ringing, lift the cover off the proximity sensor.

See that screen stays blanked and only way to unblank it is to push
button.

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https://bugs.launchpad.net/bugs/1524648

Title:
  Display doesn't turn on for incoming phone call when proximity sensor
  triggered

Status in Canonical System Image:
  Incomplete
Status in telephony-service package in Ubuntu:
  Confirmed
Status in unity-system-compositor package in Ubuntu:
  Confirmed

Bug description:
  I just received two phone calls.  In each case the phone started
  ringing but the screen stayed black.  In the first case I let it ring
  for a while hoping that it would magically wake up, since some bugs do
  seem to work that way.  But nothing happened.  I was unwilling to
  press the power button since in iOS that immediately hangs up the
  call.  Eventually however I did press it, and the screen woke up.  But
  I was too late to answer the call.  When the person phoned back the
  screen was black again, so I pressed the power button and was then
  able to slide the slider to answer the call.

  I don't think this is the same as Bug #1493574, since that bug seems
  to happen after the phone has been answered.

  Syslog of about the right time attached.  Phone reports the times of
  the calls as 15:41 and 15:47.

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