Public bug reported:

Using Ubuntu 17.10 on desktop computer using Intel HD4000 Graphics,
connected to a Dell monitor using DisplayPort. When the monitor is
powered off, the whole desktop crashes as soon as it is powered on
again.

/var/log/syslog reports:

Nov 28 21:36:02 cube kernel: [12009.262611] show_signal_msg: 73 callbacks 
suppressed
Nov 28 21:36:02 cube kernel: [12009.262612] gnome-shell[1949]: segfault at 18 
ip 00007fc9aef082d4 sp 00007ffcf90f2328 error 4 in 
libmutter-1.so.0.0.0[7fc9aee69000+142000]
Nov 28 21:36:02 cube nautilus[2475]: Error reading events from display: Broken 
pipe
Nov 28 21:36:02 cube update-notifier[2588]: Error reading events from display: 
Broken pipe
Nov 28 21:36:02 cube dropbox[2267]: Error reading events from display: Broken 
pipe
Nov 28 21:36:02 cube org.gnome.Shell.desktop[1949]: (EE)
Nov 28 21:36:02 cube org.gnome.Shell.desktop[1949]: Fatal server error:
Nov 28 21:36:02 cube org.gnome.Shell.desktop[1949]: (EE) failed to read Wayland 
events: Broken pipe
Nov 28 21:36:02 cube org.gnome.Shell.desktop[1949]: (EE)
Nov 28 21:36:02 cube gnome-session[1899]: gnome-session-binary[1899]: WARNING: 
Application 'org.gnome.Shell.desktop' killed by signal 11
Nov 28 21:36:02 cube gnome-session-binary[1899]: Unrecoverable failure in 
required component org.gnome.Shell.desktop
Nov 28 21:36:02 cube gnome-session-binary[1899]: WARNING: Application 
'org.gnome.Shell.desktop' killed by signal 11
Nov 28 21:36:02 cube gsd-rfkill[2080]: g_object_notify: object class 
'CcRfkillGlib' has no property named 'kernel-noinput'
Nov 28 21:36:02 cube gsd-color[1449]: failed to connect to device: Failed to 
connect to missing device 
/org/freedesktop/ColorManager/devices/xrandr_Dell_Inc__DELL_U3011_PH5NY114142L_coderazzi_1000
Nov 28 21:36:02 cube kernel: [12009.448053] rfkill: input handler enabled
Nov 28 21:36:02 cube gnome-shell[1204]: clutter-actor.c:10049: Actor 
'StScrollBar' tried to allocate a size of -13.00 x 14.00
Nov 28 21:36:02 cube gnome-shell[1204]: clutter-actor.c:10049: Actor 
'StBoxLayout' tried to allocate a size of -13.00 x 1.00
Nov 28 21:36:02 cube gnome-shell[1204]: clutter-actor.c:10049: Actor 
'StScrollBar' tried to allocate a size of -13.00 x 14.00
Nov 28 21:36:02 cube gnome-shell[1204]: clutter-actor.c:10049: Actor 
'StBoxLayout' tried to allocate a size of -13.00 x 1.00
Nov 28 21:36:03 cube gnome-shell[1204]: clutter-actor.c:10049: Actor 
'StScrollBar' tried to allocate a size of -13.00 x 14.00
Nov 28 21:36:03 cube gnome-shell[1204]: clutter-actor.c:10049: Actor 
'StBoxLayout' tried to allocate a size of -13.00 x 1.00
Nov 28 21:36:04 cube gnome-shell[1204]: 0x20000e (gnome-shel): frame_complete 
callback never occurred for frame 108
Nov 28 21:36:06 cube org.a11y.atspi.Registry[1983]: XIO:  fatal IO error 11 
(Resource temporarily unavailable) on X server ":0"
Nov 28 21:36:06 cube org.a11y.atspi.Registry[1983]:       after 2285 requests 
(2285 known processed) with 0 events remaining.


It will then show the login page again.

The system is full updated to latest version

** Affects: kubuntu-meta (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1734998

Title:
  Desktop killed when powering off a monitor using Display Port

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