Thanks and sorry for the trouble...
I think this is either a bug in Mutter's fullscreen unredirect feature
(which exists for Xorg sessions only), or it could be another instance
of bug 561370 which is very intermittent.
To prove the issue is NOT bug 561370 we would probably need to see the
same flickering in a non-GTK app.
** Package changed: gnome-shell (Ubuntu) => mutter (Ubuntu)
** Changed in: mutter (Ubuntu)
Importance: Undecided => Low
** Changed in: mutter (Ubuntu)
Status: Incomplete => New
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https://bugs.launchpad.net/bugs/1861391
Title:
Full-screen window flickers once when switching to it
Status in mutter package in Ubuntu:
New
Bug description:
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.
---
ProblemType: Bug
ApportVersion: 2.20.11-0ubuntu8.2
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
DistroRelease: Ubuntu 19.10
InstallationDate: Installed on 2019-11-16 (75 days ago)
InstallationMedia: Ubuntu 19.10 "Eoan Ermine" - Release amd64 (20191017)
Package: mutter 3.34.1+git20191107-1ubuntu1~19.10.1
PackageArchitecture: amd64
ProcVersionSignature: Ubuntu 5.3.0-29.31-generic 5.3.13
Tags: eoan
Uname: Linux 5.3.0-29-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip docker lpadmin lxd plugdev sambashare sudo
_MarkForUpload: True
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