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[Alexandros Frantzis <alexandros.frantzis@xxxxxxxxxxxxx>]

I am able to reproduce the issue by starting a (fake) call and
covering/uncovering the proximity sensor for a bit (some times it can
take some time but I always eventually get the problem).

It seems that powerd stops handling proximity events (although the
kernel receives them) at some point. Pressing the power key somehow
unblocks whatever is that has been blocked, and all queued events are
then processed in quick succession. I don't know yet if it's a problem
with powerd or some layer below it. Investigation continues.

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https://bugs.launchpad.net/bugs/1512100

Title:
  Meizu MX4 (Arale r6=OTA7) - Blinking screen during the call if you
  remove the phone from your ear

Status in Canonical System Image:
  Confirmed
Status in powerd package in Ubuntu:
  In Progress
Status in unity-system-compositor package in Ubuntu:
  New

Bug description:
  I have a problem with my Meizu MX4 (Arale r6). 
  During a call if you remove the phone from your ear, sometimes (not always) the screen remains turned off. When you try to push the power button to wake up the screen, that starts blinking and it's not possible to hang up. The screen remains in that condition even after the end of the call.
  When it keeps blinking I try to hold the button down and in few seconds the screen turns black and the phone starts working again. Sometimes, instead, it starts working again by itself.

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