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[Martyn Lloyd-Kelly <martynlloydkelly@xxxxxxxxx>]

Not sure if this gives any of the devs a clue as to what may be
happening but the unlock/lock fix doesn't work if you do it very
quickly.  It does work if you leave the phone unlocked for (roughly) 5
seconds before locking again; OS resource timing issue?  I have an Meizu
MX4 too.

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https://bugs.launchpad.net/bugs/1477838

Title:
  [MX4] Crackling sound after playing audio and suspended

Status in Canonical System Image:
  Confirmed
Status in pulseaudio package in Ubuntu:
  Confirmed

Bug description:
  The Meizu MX4 is doing a weird "tic tic tic..." after receive a
  notification (from telegram, mail...) and it's suspended.

  ------

  When I press the screen lock button on the MX4 shortly after playing
  music or ending a phone call I hear a radio/fuzzy distorted noise
  coming from the phone. To make it stop I need to unlock and lock the
  screen again but this is not ideal.

  -----

  When the screen is locked and the playing song is finished and waiting
  for a stopped signal, MX4 will do a weird lower sound.

  -----

  How to reproduce (Note this does not always work, the phone needs to
  be in some specific state yet to be determined)

  Ensure MX4 is not plugged into USB
  Call the MX4 and hear the ringtone
  Dismiss the call
  Push the power button to turn off the screen
  Tick Tick Tick
  Push the power button to turn on the screen
  hissing
  Push the power button to turn off the screen
  Tick Tick Tick
  etc

  It will not clear until you play another sound
  Does not happen in silent mode of course

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