Le 14 septembre 2025 23:06:13 GMT+02:00, Laurent Bergeron
<laurent.bergeron.whatthe...@gmail.com> a écrit :
>Dear Maintainer,
Dear Laurent,
>I wanted to change the background of SDDM and wondered how. After some
>research that told me to click on the "change background" button in the system
>settings, I made a Reddit post asking why I
>didn't see it. I was redirected to another similar post made by someone who
>encountered the same issue as me. The answers to their post said it's a Debian
>13 specific issue and that other
>distros, when on the same version version of KDE Plasma, had the button
>visible. Here's the link to said post:
Yes this is due to an upstream bug / limitation [1] that sddm-kcm currently
writes to /usr/share. This doesn't follow the Filesystem Hierarchy Standard [2]
since this path is supposed to be read-only and under the responsibility of the
package manager, so the current implementation could lead to user configuration
loss.
Until this is fixed and sddm-kcm can write its configuration to /etc we chose
to disable the feature in the Debian package.
[1] <https://bugs.kde.org/show_bug.cgi?id=500151>
[2] <https://refspecs.linuxfoundation.org/FHS_3.0/fhs/ch04s11.html>
>If I'm not mistaking the only way right now to change the background image of
>SDDM right now is to change /usr/share/sddm/themes/debian-breeze/theme.conf.
Yes that's always a possibility although I would not call it the "right way".
The changes may get overwritten by future packages updates as mentioned above.
Ideally we should be able to override the background setting in /etc/sddm.conf
but I'm not sure if that can work with the current SDDM and theme source code.
Feel free to experiment and report back if you find such a solution.
Happy hacking,
--
Aurélien
