Arch Linux

Sadak

Member

Registered: 2024-11-05

Posts: 2

Help: SDDM Theme Causes Crash on External Monitor

Hi everyone, I'm new to Arch and have run into an issue with SDDM and its theme.

When I disable the theme by removing the

[Theme]

section in

/etc/sddm.conf.d/kde_settings.conf

, everything works fine. However, when I select the Breeze theme via System Settings -> Colors & Themes -> Login Screen (SDDM) and then connect an external monitor (not the built-in display), SDDM freezes after I input my password and press Enter. The mouse and keyboard are still responsive—buttons change color when hovered—but the splash screen doesn't appear, no matter how long I wait.

If I disconnect the external monitor and use the built-in display to log in, the theme works fine and the splash screen shows up immediately.

I really want to apply the Breeze theme to make my Arch system look beautiful. Does anyone know how to fix this issue with SDDM? Any help would be greatly appreciated!

Sadak

Member

Registered: 2024-11-05

Posts: 2

Re: Help: SDDM Theme Causes Crash on External Monitor

my system info:

Operating System: Arch Linux 
KDE Plasma Version: 6.2.3
KDE Frameworks Version: 6.7.0
Qt Version: 6.8.0
Kernel Version: 6.11.6-arch1-1 (64-bit)
Graphics Platform: X11
Processors: 8 × Intel® Core™ i7-4900MQ CPU @ 2.80GHz
Memory: 15.5 GiB of RAM
Graphics Processor: Quadro K2100M/PCIe/SSE2
Manufacturer: LENOVO
Product Name: 20BHS0EU09
System Version: ThinkPad W540

my graphics card info:

+-----------------------------------------------------------------------------+
| NVIDIA-SMI 390.157                Driver Version: 390.157                   |
|-------------------------------+----------------------+----------------------+
| GPU  Name        Persistence-M| Bus-Id        Disp.A | Volatile Uncorr. ECC |
| Fan  Temp  Perf  Pwr:Usage/Cap|         Memory-Usage | GPU-Util  Compute M. |
|===============================+======================+======================|
|   0  Quadro K2100M       Off  | 00000000:01:00.0 Off |                  N/A |
| N/A   46C    P0    N/A /  N/A |    535MiB /  1999MiB |      0%      Default |
+-------------------------------+----------------------+----------------------+

alex3772

Member

Registered: 2013-10-18

Posts: 6

Re: Help: SDDM Theme Causes Crash on External Monitor

This is an issue upstream, there is currently no fix available AFAIK.
Maybe you can find a workaround, that works for you in the links listed at the bottom of this post.
I just switched to the Elarun theme. Its not the same but looks OK for me.

, see also:
* Original Thread with this issue: https://bbs.archlinux.org/viewtopic.php?id=300374
* Bug ticket in KDE: https://bugs.kde.org/show_bug.cgi?id=494804
* Bug ticket in Qt: https://bugreports.qt.io/browse/QTBUG-130767