And again. Same result:

[2016-12-21:09:33:51.644] qtmir.screens: ScreensModel::ScreensModel
[2016-12-21 09:33:51.647464] mirplatform: Found graphics driver: mir:mesa-kms 
(version 0.25.0)
[2016-12-21 09:33:51.647496] mirplatform: Found graphics driver: mir:mesa-x11 
(version 0.25.0)
[2016-12-21 09:33:51.647662] mirplatform: Found graphics driver: 
mir:stub-graphics (version 0.25.0)
[2016-12-21 09:33:51.647672] mirplatform: Found graphics driver: 
throw-on-creation (version 0.25.0)
[2016-12-21:09:33:51.647] qtmir.mir: MirServer created
[2016-12-21:09:33:51.647] qtmir.mir: Command line arguments passed to Qt: 
("unity8", "--mode=full-shell")
[2016-12-21:09:33:51.648] QSocketNotifier: Can only be used with threads 
started with QThread
[2016-12-21 09:33:51.649228] mirserver: Starting
[2016-12-21 09:33:51.666761] mirserver: Using nested cursor
[2016-12-21 09:33:51.667204] mirserver: Initial display configuration:
[2016-12-21 09:33:51.667227] mirserver:   Output 36: VGA disconnected
[2016-12-21 09:33:51.667232] mirserver:   Output 39: DisplayPort disconnected
[2016-12-21 09:33:51.667235] mirserver:   Output 45: HDMI-A disconnected
[2016-12-21 09:33:51.667249] mirserver:   Output 48: DisplayPort connected, used
[2016-12-21 09:33:51.667256] mirserver:       Physical size 24.0" 520x320mm
[2016-12-21 09:33:51.667260] mirserver:       Current mode 1920x1200 59.95Hz
[2016-12-21 09:33:51.667263] mirserver:       Preferred mode 1920x1200 59.95Hz
[2016-12-21 09:33:51.667266] mirserver:       Logical position +0+0
[2016-12-21 09:33:51.667270] mirserver:   Output 52: HDMI-A disconnected
[2016-12-21:09:33:51.667] qtmir.mir: 
PromptSessionListener::PromptSessionListener - this= 
PromptSessionListener(0x7fc0ec1c09d0)
[2016-12-21:09:33:51.667] qtmir.mir: SessionListener::SessionListener - this= 
SessionListener(0x7fc0ec1c0660)
[2016-12-21:09:33:51.667] qtmir.mir: MirWindowManagerImpl::MirWindowManagerImpl
[2016-12-21 09:33:51.667834] mirserver: Mir version 0.25.0
[2016-12-21:09:33:51.667] qtmir.screens: QtCompositor::start
[2016-12-21:09:33:51.676] qtmir.screens: ScreensModel::update
[2016-12-21:09:33:51.676] qtmir.sensor: Screen - nativeOrientation is: 
Qt::ScreenOrientation(LandscapeOrientation)
[2016-12-21:09:33:51.676] qtmir.sensor: Screen - initial currentOrientation is: 
Qt::ScreenOrientation(LandscapeOrientation)
[2016-12-21:09:33:51.678] qtmir.screens: Added Screen with id 48 and geometry 
QRect(0,0 1920x1200)
[2016-12-21:09:33:51.678] qtmir.screens: Screen::setMirDisplayBuffer 
Screen(0x55908c35bfd0) 0x7fc0ec140a30 0x7fc0ec140b80
[2016-12-21:09:33:51.678] qtmir.screens: =======================================
[2016-12-21:09:33:51.678] qtmir.screens: Screen(0x55908c35bfd0) - id: 48 
geometry: QRect(0,0 1920x1200) window: 0x0 type: "DisplayPort" scale: 1
[2016-12-21:09:33:51.678] qtmir.screens: =======================================
[2016-12-21:09:33:51.735] qtmir.applications: 
UnityApplicationPlugin::registerTypes - this= 
UnityApplicationPlugin(0x7fc0d413ee40) uri= Unity.Application
[2016-12-21:09:33:51.768] QObject::connect: No such signal 
QDBusAbstractInterface::FlightModeChanged(bool) in 
/build/telephony-service-GdIWd2/telephony-service-0.1+17.04.20161129/libtelephonyservice/telepathyhelper.cpp:99
[2016-12-21:09:33:53.142] file:///usr/share/unity8//OrientedShell.qml:253:5: 
Type Shell unavailable 
         Shell { 
         ^
[2016-12-21:09:33:53.142] file:///usr/share/unity8//Shell.qml:267:9: Element is 
not creatable. 
             SurfaceManager { 
             ^
[2016-12-21:09:33:53.142] qtmir.screens: Screen::setWindow - new geometry for 
shell surface ShellView(0x55908c451250) QRect(0,0 1920x1200)
[2016-12-21:09:33:53.142] qtmir.screens: ScreenWindow 0x55908c47b1a0 with 
window ID 1 backed by Screen(0x55908c35bfd0) with ID 48
[2016-12-21:09:33:53.142] qtmir.screens: QWindow ShellView(0x55908c451250) with 
geom QRect(0,0 1920x1200) is backed by a Screen(0x55908c35bfd0) with geometry 
QRect(0,0 1920x1200)
[2016-12-21:09:33:53.143] qtmir.screens: ScreensModel::onCompositorStarting
[2016-12-21:09:33:53.143] qtmir.screens: ScreensModel::update
[2016-12-21:09:33:53.143] qtmir.screens: Screen::setMirDisplayBuffer 
Screen(0x55908c35bfd0) 0x7fc0ec140a30 0x7fc0ec140b80
[2016-12-21:09:33:53.143] qtmir.screens: =======================================
[2016-12-21:09:33:53.143] qtmir.screens: Screen(0x55908c35bfd0) - id: 48 
geometry: QRect(0,0 1920x1200) window: 0x55908c47b1a0 type: "DisplayPort" 
scale: 1
[2016-12-21:09:33:53.143] qtmir.screens: =======================================
[2016-12-21:09:33:53.143] qtmir.screens: ScreenWindow::setExposed 
0x55908c47b1a0 true 0x55908c35bfe0


** Tags added: black-screen

** Also affects: canonical-devices-system-image
   Importance: Undecided
       Status: New

** Changed in: canonical-devices-system-image
   Importance: Undecided => Critical

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https://bugs.launchpad.net/bugs/1651617

Title:
  [regression] Unity8 no longer visible (just a black screen) on zesty,
  although the process is running

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