Thanks for the bug report. First please try deleting any local
extensions:
cd ~/.local/share/gnome-shell/
rm -rf extensions
and then log in again. If that doesn't eliminate the bug then please
run:
apport-collect 2113786
to upload more system information.
** Changed in: gnome-shell (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/2113786
Title:
Dark rectangle over gnome-terminal is a ghost of a "visual alert"
Status in gnome-shell package in Ubuntu:
Incomplete
Bug description:
I started getting dark rectangles obscuring my main gnome-terminal
windows when I left the session locked for a while. Description of
chasing and removing these is at
https://linux.codidact.com/posts/293718 , and the screenshot below
shows some of those rectangles after I poked their size and opacity to
better illustrate what happens.
Now I found the cause and a recipe to reproduce the bug.
1. Open a gnome-terminal (3.52.0-1ubuntu2) or xterm (390-1ubuntu3) window;
but not foot (1.16.2-2ubuntu0.1) because it does not seem to be able to alert
on terminal bell. For better confirmation: make the window a distinctive size,
not full screen.
2. In gnome-control-center go to Accessibility > Hearing > Visual Alerts.
Enable for "entire window". Bug seems not to trigger for "entire screen", but I
didn't try hard because I don't want to dig myself out of that mess.
3. Run something that generates ASCII BEL for the remainder of the test such
as `while true; do echo -ne \\a; sleep 1; done` . In my case it was the
occasional bell of an email, a random factor which made it harder to figure out
the cause.
4. Lock the screen. Bug does not trigger when screen is active. By rectangle
counting, I suspect the bug also triggers during the password unlock dialog.
5. Expected: each visual alert to be finished and gone within a second of the
BEL.
6. What you find when you unlock: a pile of semi-transparent dark rectangles
stacked on your alerting window, approximately one per BEL emitted during the
lock time. One or two might leave the text legible but dim, but more often the
window is plain black.
7. Uf necessary, or you are curious about what they are: use the Wayland
looking glass to find and delete the rectangles.
https://linux.codidact.com/posts/293718
8. Switch Visual Alerts off and be grateful that you don't really need them. 🫣
Other notes that might be relevant:
Grok advises that gnome-shell is the package providing this a11y
function, so that's why I'm offering the report here.
Grok also advises to give `journalctl /usr/bin/gnome-shell` output,
but there is nothing recent ie. since last reboot.
The opacity of these rectangles seems to vary, as if the visual alert
were progressing as usual and then got an exception which prevented it
becoming transparent and being deleted?
It seems the visual alert was incomplete and not deleted. Mouse clicks
can pass through them but the window's image is blocked or greatly
darkened.
The size of the rectangle seems to match the area flashed. This is
more obvious after watching xterm flash repeatedly.
With gnome-terminal it is possible to drag tabs out of the obscured
window to "rescue" them... if you can see or guess where the tab is.
---
Using a fairly standard Ubuntu 24.04.2 LTS Noble desktop on x86_64,
$ lsb_release -rd
No LSB modules are available.
Description: Ubuntu 24.04.2 LTS
Release: 24.04
$ apt-cache policy gnome-shell
gnome-shell:
Installed: 46.0-0ubuntu6~24.04.9
Candidate: 46.0-0ubuntu6~24.04.9
Version table:
*** 46.0-0ubuntu6~24.04.9 500
500 http://archive.ubuntu.com/ubuntu noble-updates/main amd64 Packages
100 /var/lib/dpkg/status
46.0-0ubuntu6~24.04.3 500
500 http://security.ubuntu.com/ubuntu noble-security/main amd64
Packages
46.0-0ubuntu5 500
500 http://archive.ubuntu.com/ubuntu noble/main amd64 Packages
$ apt-cache policy xwayland
xwayland:
Installed: 2:23.2.6-1ubuntu0.5
Candidate: 2:23.2.6-1ubuntu0.5
Version table:
*** 2:23.2.6-1ubuntu0.5 500
500 http://archive.ubuntu.com/ubuntu noble-updates/main amd64 Packages
100 /var/lib/dpkg/status
2:23.2.6-1ubuntu0.4 500
500 http://security.ubuntu.com/ubuntu noble-security/main amd64
Packages
2:23.2.6-1 500
500 http://archive.ubuntu.com/ubuntu noble/main amd64 Packages
---
So long and thanks for all the adjectival animals!
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