Comment 3 for bug 1576760

And again:

04:41:17 [ RUN ] NestedServer.when_monitor_plugged_in_client_is_notified_of_new_display_configuration
04:41:17 [2016-05-25 04:36:13.723943] mirserver: Starting
04:41:17 [2016-05-25 04:36:13.729099] mirserver: Selected driver: dummy (version 0.23.0)
04:41:17 [2016-05-25 04:36:13.788770] mirserver: Using software cursor
04:41:17 [2016-05-25 04:36:13.852022] mirserver: Selected input driver: mir:stub-input (version: 0.23.0)
04:41:17 [2016-05-25 04:36:13.855163] mirserver: Mir version 0.23.0
04:41:17 [2016-05-25 04:36:13.925738] mirserver: Starting
04:41:17 [2016-05-25 04:36:13.991764] mirserver: Using nested cursor
04:41:17 [2016-05-25 04:36:14.921068] mirserver: Initial display configuration:
04:41:17 [2016-05-25 04:36:14.922167] mirserver: 1.1: VGA 0.0" 0x0mm
04:41:17 [2016-05-25 04:36:14.922658] mirserver: Current mode 640x480 60.00Hz
04:41:17 [2016-05-25 04:36:14.922860] mirserver: Preferred mode 640x480 60.00Hz
04:41:17 [2016-05-25 04:36:14.923032] mirserver: Logical position +0+0
04:41:17 [2016-05-25 04:36:14.923408] mirserver: 1.2: VGA 0.0" 0x0mm
04:41:17 [2016-05-25 04:36:14.923638] mirserver: Current mode 1920x1080 60.00Hz
04:41:17 [2016-05-25 04:36:14.923898] mirserver: Preferred mode 1920x1080 60.00Hz
04:41:17 [2016-05-25 04:36:14.924114] mirserver: Logical position +640+0
04:41:17 [2016-05-25 04:36:14.960629] mirserver: Mir version 0.23.0
04:41:17 [2016-05-25 04:36:15.574104] mirserver: New display configuration:
04:41:17 [2016-05-25 04:36:15.575497] mirserver: 1.1: VGA 0.0" 0x0mm
04:41:17 [2016-05-25 04:36:15.575792] mirserver: Current mode 640x480 60.00Hz
04:41:17 [2016-05-25 04:36:15.576055] mirserver: Preferred mode 640x480 60.00Hz
04:41:17 [2016-05-25 04:36:15.576276] mirserver: Logical position +0+0
04:41:17 [2016-05-25 04:36:15.576859] mirserver: 1.2: VGA 0.0" 0x0mm
04:41:17 [2016-05-25 04:36:15.577112] mirserver: Current mode 1920x1080 60.00Hz
04:41:17 [2016-05-25 04:36:15.581743] mirserver: Preferred mode 1920x1080 60.00Hz
04:41:17 [2016-05-25 04:36:15.582038] mirserver: Logical position +0+0
04:41:17 [2016-05-25 04:36:15.599121] mirserver: 1.3: VGA 0.0" 0x0mm
04:41:17 [2016-05-25 04:36:15.606066] mirserver: Current mode 640x480 60.00Hz
04:41:17 [2016-05-25 04:36:15.606708] mirserver: Preferred mode 640x480 60.00Hz
04:41:17 [2016-05-25 04:36:15.606955] mirserver: Logical position +0+0
04:41:17 /��BUILDDIR��/mir-0.23.0+xenial1168bzr3516/tests/acceptance-tests/test_nested_mir.cpp:1079: Failure
04:41:17 Value of: client_config_changed.raised()
04:41:17 Actual: false
04:41:17 Expected: true
04:41:17 [2016-05-25 04:36:16.639727] mirserver: Stopping
04:41:17 [2016-05-25 04:36:16.756083] mirserver: Stopping
04:41:17 [ FAILED ] NestedServer.when_monitor_plugged_in_client_is_notified_of_new_display_configuration (3151 ms)

https://mir-jenkins.ubuntu.com/job/build-2-binpkg-mir/arch=i386,compiler=gcc,platform=mesa,release=xenial/1139/consoleFull