@Pat that timer is the first thing I thought of when I saw this bug. I
looked into it a bit, and found that the timer is synchronized with the
animation timer. This means it has 16 ms resolution. This shouldn't
matter as the only purpose of the timer is to ensure that the greeter is
shown after the current event is processed. That said, I think we should
log when/if the timer is triggering. Since I still can't reproduce this,
I was hoping you could run an instrumented version of Unity8. If you are
able to, would you prefer a patch (just qml/init changes, so you
shouldn't have to recompile anything) or a deb?

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https://bugs.launchpad.net/bugs/1489323

Title:
  Greeter not always being shown

Status in Canonical System Image:
  In Progress
Status in unity-system-compositor package in Ubuntu:
  New
Status in unity8 package in Ubuntu:
  Confirmed

Bug description:
  On last few weeks of rc-proposed and ota6 on MX4
  On occasion when the phone resumes, either through a power button press or an 
incoming event, the greeter is not shown and either the passcode entry page or 
the last running app is shown directly.

  This is intermittent but once in this state it is very consistently behaving 
this way.
  Update: while that was originally true now (build 136) it seems to clear once 
the button is pressed, the greeter is shown next resume.

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