Bug 511338

Summary:	KDE theme setting resets after log out everytime after updating to KDE 6.5 and 6.5.1
Product:	[Plasma] plasmashell	Reporter:	eepycat
Component:	general	Assignee:	Plasma Bugs List <plasma-bugs-null>
Status:	RESOLVED WORKSFORME
Severity:	normal	CC:	kde, natalie_clarius, nate
Priority:	NOR	Keywords:	regression
Version First Reported In:	6.5.0
Target Milestone:	1.0
Platform:	Arch Linux
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:

Description eepycat 2025-10-29 20:51:14 UTC

SUMMARY
I have used CachyOS(Arch variant) for a while, all worked perfectly. But after updating to KDE 6.5 using yay, The KDE theme setting will reset to the default Breeze after every log out and log in. I tried to update to KDE 6.5.1 but it didn’t fix it. KDE 6.4.5-4.1 (Last version I'm using before 6.5 update) don't seems to have this problem. 

STEPS TO REPRODUCE
1. Set up a theme different than default one. In my case, Materia Dark applied to most of the themes, kvantum also used.
2. Log out
3. Log in

OBSERVED RESULT
All theme settings turn back to the default breeze except wallpaper. 

EXPECTED RESULT
Theme setting preserved after logging out as it is before. 

SOFTWARE/OS VERSIONS
Windows: N/A
macOS: N/A
(available in the Info Center app, or by running `kinfo` in a terminal window)
Linux/KDE Plasma: CachyOS Linux 
KDE Plasma Version: 6.5.1
KDE Frameworks Version: 6.19.0
Qt Version: 6.10.0

ADDITIONAL INFORMATION
All was tested in Wayland session. Another problem that may be related is that I have set a wallpaper for sddm from System settings - Colours & Themes - Login Screen (SDDM), but sddm isn't applying that setting correctly, as it is using the default wallpaper from KDE 6.5 update, instead of my .jpg file.

Comment 1 eepycat 2025-10-29 20:53:23 UTC

The sddm wallpaper issue is fixed through reapplying the wallpaper. The main problem persists.

Comment 2 Nate Graham 2025-10-30 16:52:22 UTC

Does this reproduce in a new clean user account on the same computer in which you change the theme in the same way?

Comment 3 eepycat 2025-10-31 06:43:16 UTC

(In reply to Nate Graham from comment #2)
> Does this reproduce in a new clean user account on the same computer in
> which you change the theme in the same way?

I created a new standard account via system setting GUI and it don't have the problem.  Is this a local config problem?

Comment 4 Nate Graham 2025-10-31 18:02:21 UTC

Yep. Unfortunately I can't speculate about what it might be; you'll have to do some investigation and debugging to figure it out.

Comment 5 eepycat 2025-11-02 00:08:28 UTC

Problem solved by renaming `~/.config/kdeglobals` and `~/.config/Kvantum` with .bak and let kde recreate the config. Seems like a inconsistency with kde or Kvantum's config handling in new version.