Bug#1089927: sddm-theme-debian-breeze: Does not work in KDE Plasma 6

[Huey Chen]

Package: sddm-theme-debian-breeze
Version: 4:6.2.4-1
Severity: important
X-Debbugs-Cc: ***@outlook.com

Dear Maintainer,

Since upgrading KDE Plasma from 5 to 6, the SDDM login screen is simply white and hard to see any icons. This only happens when using the Debian Breeze theme since it only support KDE Plasma 5.


-- System Information:
Debian Release: trixie/sid
APT prefers unstable
APT policy: (500, 'unstable')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 6.12.3-amd64 (SMP w/12 CPU threads; PREEMPT)
Locale: LANG=C.UTF-8, LC_CTYPE=C.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages sddm-theme-debian-breeze depends on:
ii plasma-desktoptheme 6.2.4-1
ii plasma-workspace 4:6.2.4-1
ii sddm-theme-breeze 4:6.2.4-1

Versions of packages sddm-theme-debian-breeze recommends:
ii desktop-base 13.0.0~pre1
ii sddm 0.21.0-5

sddm-theme-debian-breeze suggests no packages.

-- no debconf information

[Patrick Franz]

Hej Ruben,

Something seems to have broken in the upgrade from plasma 6.6 to 6.8
as breeze is broken in plasmashell as well, oxygen still seems to
work.

You might be missing "qt6-svg-plugins". That will bring your icons back.
It should be installed automatically unless you have recommended
packages disabled.

[Didier 'OdyX' Raboud]

Hello there,

I had the same issue (completely white background), which I could reproduce
with:

$ sddm-greeter-qt6 --test-mode --theme /usr/share/sddm/themes/debian-breeze

I was consistently getting the following error:

file:///usr/share/sddm/themes/breeze/Background.qml:21:5: QML QQuickImage:
Cannot open: file:///usr/share/sddm/themes/breeze/background.svg

And indeed, there's no such file on my computer. Then I found that there was a
superfluous file (not-managed by dpkg) in the theme directory:

$ cat /usr/share/sddm/themes/debian-breeze/theme.conf.user
[General]
background=background.svg
type=image

Removing this file solved the sddm-greeter test-mode at least (I'll report
back only if it did _not_ solve the issue post re-login).

This looks like a file created by systemsettings in the wrong folder (it
should _really_ be written somewhere in /etc); and I'd suggest it should be
removed on upgrade, to restore the sddm-theme-debian-breeze behaviour.

Best,

OdyX

Post by Huey Chen
Since upgrading KDE Plasma from 5 to 6, the SDDM login screen is simply
white and hard to see any icons. This only happens when using the Debian
Breeze theme since it only support KDE Plasma 5.