Daniel, not sure if they're related, but it seems that when I get back
from the "slide" screen (even if not locked) I'm getting a lot of these
errors repeated in journalctl:

May 24 14:52:47 kashyyyk gnome-shell[6901]: Object Meta.Background 
(0x562f8156e590), has been already deallocated - impossible to access to it. 
This might be caused by the fact that the object has been destroyed from C code 
using something such as destroy(), dispose(), or remove() vfuncs
May 24 14:52:47 kashyyyk org.gnome.Shell.desktop[6901]: == Stack trace for 
context 0x562f7ecee330 ==
May 24 14:52:47 kashyyyk org.gnome.Shell.desktop[6901]: #0 0x7ffe191266b0 b   
resource:///org/gnome/shell/ui/background.js:718 (0x7f7fbc60f450 @ 22)
May 24 14:52:47 kashyyyk org.gnome.Shell.desktop[6901]: #1 0x7ffe19127610 b   
resource:///org/gnome/shell/ui/tweener.js:113 (0x7f7fc81c7e68 @ 37)
May 24 14:52:47 kashyyyk org.gnome.Shell.desktop[6901]: #2 0x7ffe19128580 b   
resource:///org/gnome/gjs/modules/tweener/tweener.js:208 (0x7f7fc81d3b38 @ 54)
May 24 14:52:47 kashyyyk org.gnome.Shell.desktop[6901]: #3 0x7ffe191286d0 b   
resource:///org/gnome/gjs/modules/tweener/tweener.js:337 (0x7f7fc81d3bc0 @ 1626)
May 24 14:52:47 kashyyyk org.gnome.Shell.desktop[6901]: #4 0x7ffe19128780 b   
resource:///org/gnome/gjs/modules/tweener/tweener.js:350 (0x7f7fc81d3c48 @ 100)
May 24 14:52:47 kashyyyk org.gnome.Shell.desktop[6901]: #5 0x7ffe19128810 b   
resource:///org/gnome/gjs/modules/tweener/tweener.js:365 (0x7f7fc81d3cd0 @ 10)
May 24 14:52:47 kashyyyk org.gnome.Shell.desktop[6901]: #6 0x7ffe19128900 b   
resource:///org/gnome/gjs/modules/signals.js:128 (0x7f7fc81d3230 @ 386)
May 24 14:52:47 kashyyyk org.gnome.Shell.desktop[6901]: #7 0x7ffe191289b0 b   
resource:///org/gnome/shell/ui/tweener.js:245 (0x7f7fc81cf808 @ 159)
May 24 14:52:47 kashyyyk org.gnome.Shell.desktop[6901]: #8 0x7ffe19128a10 I   
resource:///org/gnome/gjs/modules/_legacy.js:82 (0x7f7fc81b5de0 @ 71)
May 24 14:52:47 kashyyyk org.gnome.Shell.desktop[6901]: #9 0x7ffe19128ab0 b   
resource:///org/gnome/shell/ui/tweener.js:220 (0x7f7fc81cf780 @ 15)

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to gnome-shell in Ubuntu.
https://bugs.launchpad.net/bugs/1769981

Title:
  Temporary screen freeze when coming back from screen standby

Status in gnome-shell package in Ubuntu:
  Incomplete

Bug description:
  When waking up the PC screen from standby, quite often the screen freezes for 
10-20s.
  I can't move the mouse or type anything. After a while, it unfreezes.
  This is quite annoying because often the freeze is long enough to send the 
screen to standby again for absence of singal, so then I have to wake it up and 
wait again.

  This is not 100% reproducible but happens very frequently, both when
  the screen is locked and when it's not.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: gnome-shell 3.28.1-0ubuntu2
  ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17
  Uname: Linux 4.15.0-20-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7
  Architecture: amd64
  CurrentDesktop: GNOME
  Date: Tue May  8 20:26:27 2018
  DisplayManager: gdm3
  InstallationDate: Installed on 2018-02-25 (72 days ago)
  InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Alpha amd64 (20180225)
  SourcePackage: gnome-shell
  UpgradeStatus: No upgrade log present (probably fresh install)

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