You have been subscribed to a public bug:
When using *some* applications (I observed it with Emacs and gnome-
terminal) in full-screen mode, they flicker once shortly after switching
to them with e.g. Alt-Tab. To reproduce it:
1. Open Emacs in full-screen mode and one other application (e.g. Chromium).
2. Switch to the other app with Alt-Tab.
3. Switch back to Emacs.
Then I observe:
1. Emacs becomes visible.
2. After a fraction of a second, the Emacs windows is transparent for a very
very short time (flicker).
3. Then, the windows is stable and usable.
Usually, I do not observe this behaviour right from the start. I have
to work with the computer for a couple of minutes to see it. I have
been unable to find out whether a certain action triggers the problem.
However, when it occurs, it does not go away again until the next
restart of the X server.
This is regression that I observe since Ubuntu 19.10.
Changes of the graphics driver does not change anything, however,
switching to Wayland solves the problem.
** Affects: gnome-shell (Ubuntu)
Importance: Undecided
Status: New
** Tags: bot-comment
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Full-screen window flickers once when switching to it
https://bugs.launchpad.net/bugs/1861391
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