Bug 503287 - Login screen themes do not apply
Summary: Login screen themes do not apply
Status: RESOLVED DOWNSTREAM
Alias: None
Product: systemsettings
Classification: Applications
Component: kcm_sddm (other bugs)
Version First Reported In: unspecified
Platform: Neon Linux
: NOR major
Target Milestone: ---
Assignee: Plasma Bugs List
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2025-04-24 12:58 UTC by Nik Nikovsky
Modified: 2025-04-25 16:13 UTC (History)
5 users (show)

See Also:
Latest Commit:
Version Fixed/Implemented In:
Sentry Crash Report:


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Description Nik Nikovsky 2025-04-24 12:58:22 UTC
SUMMARY
I wanted to apply some themes, but they never show up after applying and rebooting.

STEPS TO REPRODUCE
1. Go to System Settings > Colors and Themes > Login Screen (SDDM)
2. Download a theme (tested themes: plasmaX, Se7enAero, Sugar Candy)
3. Observe

OBSERVED RESULT
The login screen shows up as the fallback one (not Breeze)

EXPECTED RESULT
A different theme on the login screen

SOFTWARE/OS VERSIONS
Operating System: KDE neon Unstable Edition
KDE Plasma Version: 6.3.80
KDE Frameworks Version: 6.14.0
Qt Version: 6.8.3
Kernel Version: 6.11.0-24-generic (64-bit)
Graphics Platform: Wayland
Processors: 4 × Intel® Core™ i5-5300U CPU @ 2.30GHz
Memory: 8 GiB of RAM (7.6 GiB usable)
Graphics Processor: Intel® HD Graphics 5500


ADDITIONAL INFORMATION
Comment 1 Oliver Beard 2025-04-24 15:44:37 UTC
If you are referring to a problem in the SDDM KCM with SDDM and not Plasma Login, please re-open the bug and move to systemsettings [product] / kcm_sddm [component].

The following assumes that this is referring to Plasma Login:

The 'Login Screen (SDDM)' KCM is used for SDDM, and Plasma Login is configured by the 'Login Screen' KCM.

Like the lock screen, there is no theming besides wallpaper plugins and plasma style. This is by design, you can read more here: https://blog.davidedmundson.co.uk/blog/a-roadmap-for-a-modern-plasma-login-manager/
Comment 2 Nik Nikovsky 2025-04-24 16:00:09 UTC
My bad, moved
Comment 3 Nate Graham 2025-04-25 11:12:39 UTC
After step 2, did you actually *apply* any of the themes you downloaded? Or no?
Comment 4 Nik Nikovsky 2025-04-25 15:05:50 UTC
(In reply to Nate Graham from comment #3)
> After step 2, did you actually *apply* any of the themes you downloaded? Or
> no?

Yes I did.
After doing so, I even logged out.
Still using the fallback one.
Comment 5 Nate Graham 2025-04-25 15:06:32 UTC
Thanks. That means these themes are broken!
Comment 6 Nik Nikovsky 2025-04-25 15:23:09 UTC
(In reply to Nate Graham from comment #5)
> Thanks. That means these themes are broken!

Right...
Maybe there is a way to implement a check before downloading/applying a theme to prevent something like this?
Comment 7 Nate Graham 2025-04-25 16:13:07 UTC
I'm afraid not.