** Changed in: gnome-shell (Ubuntu)
Status: Confirmed => Fix Committed
** Also affects: gnome-shell (Ubuntu Lunar)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2018672
Title:
Gnome 44: GDM background configurable with gsettings
Status in gnome-shell package in Ubuntu:
Fix Committed
Status in gnome-shell source package in Lunar:
New
Bug description:
[Description]
The prior implementation of exposing the login screen background setting via
`gsettings` is not working as expected in Gnome 44 and Ubuntu 23.04.
Specifically, the background image is infact set, however, the default Gnome
theme appears as an overlay on top of the com.ubuntu.login-screen schema.
This appears as the default grey background with a remarkably high
alpha value of 0.975 from my inspection. If you set a very high
contrast background image, you can just make out the outline in
beneath the greeter.
My expectation would be that we can set the greeter parameters using
the provided gsettings keys, and set the background-color to
transparent to only display the configured background-picture-uri key.
gdm@zen:~$ gsettings list-keys com.ubuntu.login-screen
background-color
background-picture-uri
background-repeat
background-size
[Test Case]
1. Boot a desktop session
2. Verify that the default aubergine background is displayed in the greeter.
3. Login as the administrator of the machine
4. Install systemd-container
5. Switch to the GDM user:
$ sudo machinectl shell gdm@ /bin/bash
6. Apply a different background with the command:
$ gsettings set com.ubuntu.login-screen background-picture-uri
'file:///usr/share/backgrounds/Lunar-lobster-side_by_Gixo-light.png'
7. Logout
8. Verify that the image 'Lunar-lobster-side_by_Gixo-light.png' is displayed
as the background of the greeter.
9. Observe the remaining grey overlay with high alpha value. After login, the
background image is briefly displayed without the overlay before initiating the
user gnome shell session.
[Further Investigation]
PRATAP-KUMAR has done some excellent work overcoming this with their GitHub
project, and it appears that modifying the Gnome theme with this script
correctly sets the transparency. However, perhaps there are two layers to the
greeter, and even though the background image is set, the additional layer is
not exposed for configuration via gsettings.
https://github.com/PRATAP-KUMAR/ubuntu-gdm-set-
background/blob/main/ubuntu-gdm-set-
background-23.04-transparent#L168-L171
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