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I can't replicate this issue. Its appearance seems random.
Steps taken:
1. Have the screen close due to inactivity.
2. Open the screen by e.g. moving the mouse.
3. The login screen "banner" appears. This time, however, the application bar
(and maybe even the top status and notifications bar) can be seen.
4. Press enter to remove the banner and reveal the desktop environment.
5. The desktop environment is not revealed and there is the characteristic pink
reddish background of gnome in place of the banner(1st glitch).
6. Put your PC to sleep through the pause button in the menu in the top status
bar.
7. Reopen your PC.
8. Press enter to reveal the desktop environment.
9. The desktop environment is revealed and is functional for the most part.
However, the application bar acts really weird. For example, if you put the
mouse cursor to the edge of the screen, you can't click the Show apps button
(2nd glitch).
10. Press alt-F2, r and then enter to restart Gnome. This fixes the previous
issue.
Ubuntu 18.10
Gnome 3.30.1
** Affects: gdm3 (Ubuntu)
Importance: Undecided
Status: New
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Glitches related to closing the screen due to inactivity
https://bugs.launchpad.net/bugs/1808204
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Packages, which is subscribed to gdm3 in Ubuntu.
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