Arch Linux

Alarming_Thing

Member

Registered: 2021-06-01

Posts: 43

[Solved] Lost SDDM background

Installation went just fine.I just wanted to change the stock sddm login screen, so in settings I downloaded one of my favorite sddm screens called sugar-candy, and selectedit.
Upon log off or restart, I see a blank screen with just the mouse placed in the middle of screen.

Can someone please tell me how to change it back one of those (just as maya, Maldives etc?
I read somewhere the themes are placed in /usr/share/sddm/themes.They indeed are,but where is the conf file to set the current ( & working) sddm theme?
TIA

Last edited by Alarming_Thing (2024-08-22 12:35:03)

MakoHirigawa

Member

From: Russia

Registered: 2024-08-06

Posts: 2

Re: [Solved] Lost SDDM background

I think you need to change the [Theme] section in /etc/sddm.conf. Or if it empty change theme in /etc/sddm.conf.d/kde_settings.conf

Alarming_Thing

Member

Registered: 2021-06-01

Posts: 43

Re: [Solved] Lost SDDM background

If I change theme to anything other than Breeze in SDDM, including preinstalled ones, logoff leaves with me a blank screen. As Mako suggested, only way to revert is to return theme to breeze in kde_settings.conf.

Funny0facer

Member

From: Germany

Registered: 2022-12-03

Posts: 159

Re: [Solved] Lost SDDM background

are there any other files in  /etc/sddm.conf.d/ ?

---

BBCode

Nikolai5

Member

From: North West, England, UK

Registered: 2024-01-27

Posts: 274

Re: [Solved] Lost SDDM background

Please ensure you have the package "qt5-declarative" installed, else most themes will not work.

It's an optional dependency of sddm so you can install it with the --asdeps flag so it's appropriately installed as a dependency.

---

Ryzen 7 9850X3D | AMD 7800XT | KDE Plasma

Alarming_Thing

Member

Registered: 2021-06-01

Posts: 43

Re: [Solved] Lost SDDM background

Thanks Niko. However, I had to  install qt quick controls and qt graphics effects packages too.
That said, when i use sugar-candy theme and log off, I see default screen with an error message "Qt Quick Controls' can not protect module QT Controls 2 as it was not registered.
Can you help me with that? TIA.
Update: I did some web search and found someone saying 'The solution is reconfigured the command line with QtGraphicalEffects and rebuild the complete Qt sources. Qt Quick uses QtGraphicalEffects module'. I don't know how that's done.

@Funny0facer: There are no other file in that directory.

Last edited by Alarming_Thing (2024-08-22 12:16:14)

Nikolai5

Member

From: North West, England, UK

Registered: 2024-01-27

Posts: 274

Re: [Solved] Lost SDDM background

I'm sorry, I don't have that installed and the themes I use work, so perhaps it's something that sugar-candy is using specifically. You'd have to look at what the dependencies are for that theme.

Hopefully someone else can help you out with that.

---

Ryzen 7 9850X3D | AMD 7800XT | KDE Plasma

Alarming_Thing

Member

Registered: 2021-06-01

Posts: 43

Re: [Solved] Lost SDDM background

I did some web search and found someone saying 'The solution is reconfigured the command line with QtGraphicalEffects and rebuild the complete Qt sources. Qt Quick uses QtGraphicalEffects module'. I don't know how that's done.

By the way, my arch linux installation seems to use Qt5. I found that out by using 'qmake --version' and found 'Using Qt version 5.15.14 '. Is the new plasma 6 not supposed to  use Qt6?

Update : Solved this by installing qt5-quickcontrols2. Thanks for answers

Last edited by Alarming_Thing (2024-08-22 12:34:45)

V1del

Forum Moderator

Registered: 2012-10-16

Posts: 25,209

Re: [Solved] Lost SDDM background

Common utilities between qt5 and qt6 are suffixed with a version number to differentiate them, qt6's qmake is qmake6. Generally speaking the hunch that qt5  themes will not directly work with qt6 SDDM is likely correct. For prosperities sake do you still get the issue if you install the entirety of the qt5 group? If you still get it, go complain to the sugar theme devs that they should provide a qt6 version of their theme.

Edit: Ah you found it.

Last edited by V1del (2024-08-22 12:41:04)