Public bug reported:

Most of the time when I undock my ThinkPad x230, both my X and the gdm
Wayland sessions seem to crash.
This especially happens when I suspend my ThinkPad while it's docked and
then resume it when it is undocked.
This can cause users to lose data they have not saved yet.

The log says:
mutter:ERROR:backends/meta-monitor-config.c:2032:meta_monitor_config_assign_crtcs:
 assertion failed: (n_outputs == config->n_outputs)
Which seems obviously wrong if the number of outputs was changed in between.

See upstream report for more details

** Affects: mutter
     Importance: Unknown
         Status: Unknown

** Affects: mutter (Ubuntu)
     Importance: Undecided
         Status: New

** Bug watch added: Debian Bug tracker #813687
   http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=813687

** Also affects: mutter via
   http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=813687
   Importance: Unknown
       Status: Unknown

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https://bugs.launchpad.net/bugs/1585526

Title:
  mutter:ERROR when undocking ThinkPad: assertion failed: (n_outputs ==
  config->n_outputs)

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