I have uploaded the fix to the review queue for 19.10:

https://launchpad.net/ubuntu/eoan/+queue?queue_state=1

When it is accepted, you will be asked to test again, this time the
package in -proposed repository. It will be needed to allow the fix to
be officially released.

** Description changed:

+ [Impact]
+ This bug affects users who are using the GNOME Flashback session and multiple 
monitors. GNOME Flashback may crash when a new monitor is connected or turned 
on.
+ 
+ [Test Case]
+ See comment 3: 
<https://bugs.launchpad.net/ubuntu/+source/gnome-flashback/+bug/1852649/comments/3>.
+ 
+ It is better to try connecting a different monitor multiple times, as
+ the crash may be happening randomly (if current_mode is already NULL it
+ will not happen).
+ 
+ [Proposed Fix]
+ The proposed fix is a backport of the following upstream commit:
+ https://gitlab.gnome.org/GNOME/gnome-flashback/commit/26a4c9f6cfd78012
+ 
+ It is already fixed in Ubuntu Focal as part of gnome-flashback 3.34.2
+ upstream release.
+ 
+ [Regression Potential]
+ The fix consists of initializing a single pointer that was previously not 
initialized, so I cannot imagine what regressions it may cause. Anyway, 
potential regressions will be limited to the code working with monitors.
+ 
+ [Original Description]
  1) 19.10
  2) 3.34.0-1ubuntu1
  3) No segfault, not signed out
  4) I suspended last night, closed lid, then this morning I tried something 
different: plugged in first, opened laptop which woke it up, external display 
turned on, then shortly I got signed out or it locked up (had to 
`ctrl+alt+del`, forgot which happened this time around, pretty sure signed out 
then locked up)

** Also affects: gnome-flashback (Ubuntu Eoan)
   Importance: Undecided
       Status: New

** Changed in: gnome-flashback (Ubuntu)
       Status: New => Fix Released

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https://bugs.launchpad.net/bugs/1852649

Title:
  Segfaults when connecting to Thunderbolt dock/external monitir

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