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[James Tunnicliffe <1477188@xxxxxxxxxxxxxxxxxx>]

I have added a couple of comments on bug #919437 since it seems related.
Digging it seems like the Compiz session management plugin may be to
blame for windows that don't appear on first launch. My comment about
this on bug #919437

If you install CompizConfig Settings Manager and disable the Session
Management plugin (under Utility) then your windows will return after
you log out and back in.

It seems that the session management plugin can return invalid data and
Unity expects it to do the right thing.

My guess is that http://bazaar.launchpad.net/~compiz-
team/compiz/0.9.12/view/head:/plugins/session/src/session.cpp
SessionScreen::readWindow needs some sanity checking as do the state
load and save functions.

I have still had windows vanish, normally Software Updaters automatic
run, but restarting the application now always fixes it with the Compiz
session manager disabled.

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https://bugs.launchpad.net/bugs/1477188

Title:
  Windows vanish after suspend/resume

Status in Unity:
  New
Status in unity package in Ubuntu:
  New

Bug description:
  Similar to comment #4 on bug #1126221 I find windows go missing after
  a suspend/resume. This tends to be one of several Chrome windows that
  are still visible if I alt-tab and hit down with Chrome highlighted,
  but aren't visible if I use super-w.

  This isn't bug #1126221 since I am not adding/removing displays,
  unless there is something happening over the suspend/resume cycle that
  is triggering the same code path.

  I am running a triple head set up on a Radeon HD 6950 with 2GB RAM
  with the radeon driver. Here is the filtered output of xrandr with the
  display layout details:

  Screen 0: minimum 320 x 200, current 5760 x 1440, maximum 16384 x 16384
  DisplayPort-0 connected primary 2560x1440+1600+0 (normal left inverted right x axis y axis) 597mm x 336mm
     2560x1440      60.0*+  143.9    119.9     89.9
  DisplayPort-1 disconnected (normal left inverted right x axis y axis)
  HDMI-0 connected 1600x1200+0+0 (normal left inverted right x axis y axis) 408mm x 306mm
     1600x1200      60.0*+
  DVI-0 disconnected (normal left inverted right x axis y axis)
  DVI-1 connected 1600x1200+4160+0 (normal left inverted right x axis y axis) 408mm x 306mm
     1600x1200      60.0*+

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: unity 7.3.2+15.04.20150420-0ubuntu1
  ProcVersionSignature: Ubuntu 3.19.0-22.22-generic 3.19.8-ckt1
  Uname: Linux 3.19.0-22-generic x86_64
  ApportVersion: 2.17.2-0ubuntu1.1
  Architecture: amd64
  CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
  CurrentDesktop: Unity
  Date: Wed Jul 22 15:29:00 2015
  InstallationDate: Installed on 2015-02-03 (168 days ago)
  InstallationMedia: Ubuntu 14.10 "Utopic Unicorn" - Release amd64 (20141022.1)
  SourcePackage: unity
  UpgradeStatus: No upgrade log present (probably fresh install)

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