From ArchWiki

Regarding the language support on login

The instructions do no always work ( and I got this too) but there is a work-around

"Alternatively, if the above doesn't work for some reason, you could edit the file /usr/share/sddm/scripts/Xsetup and add the command setxkbmap -layout ISO, e.g. setxkbmap -layout se for a Swedish keyboard." I don't know if you want this included or if we are doing something stupid to not getting it to work. --Shieldfire (talk) 08:46, 1 June 2015 (UTC)Reply

Regarding SDDM and root login

There is some discussion on root login in SDDM here: Don't know if it's a "feature" or something is broken in SDDM or if it's a bug in Arch (and openSuse).

There's a clear statement from the developer there now stating that it is the intended behaviour. It's a feature; not a bug. (And other posts noting that, really, you shouldn't want to be running an X session as root, for example.) --cfr (talk) 01:19, 31 August 2022 (UTC)Reply

Regarding SDDM 0.14.0

As the default shipped /etc/sddm.conf was changed some parts of the page have to be changed when 0.14.0 lands in [extra]. Z3ntu (talk) 10:15, 1 September 2016 (UTC)Reply

SDDM loading before radeon module (ATI video driver)

Some update by 11-Sep-19 made SDDM unable to load normally during the boot process. The Wiki page should encourage the adding of the 'radeon' module in /etc/mkinitcpio.conf [MODULES=(radeon...)]. The update that caused the issue is for sure not related to SDDM, whose version 0.18.1 went out on 31-Mar-19. Probably is kernel or mesa related. Nicoadamo (talk)

This is already pointed out in various places, e.g. ATI#Enable early KMS. As you say, it is not related to SDDM. Closing. -- Lahwaacz (talk) 13:55, 21 September 2019 (UTC)Reply
I disagree with 'already pointed out in various places'. The article you linked only mentions how to, but never says it is a condition for a Desktop Manager to start properly at boot. Nicoadamo (talk)
So let's see if more people have this problem. -- Lahwaacz (talk) 07:00, 22 September 2019 (UTC)Reply

rootless X

Does sddm support running X rootless? It would be helpful to include a statement about this either way. (I can't find this information anywhere. I thought I'd read sddm didn't support it, but is that still the case? And, if so, is it still the recommended DM for KDE/Plasma?) --cfr (talk) 01:15, 31 August 2022 (UTC)Reply

It looks like is being worked on and there is code for it in the develop branch. You could try it with sddm-gitAUR But it looks like it doesn't work well yet If everything goes well, it might be released in the next version, 1.20. —ENV25 (talk) 12:30, 11 October 2022 (UTC)Reply (talk) 12:34, 11 October 2022 (UTC)Reply

Is warning in 2.12.1 KDE / KWin still relevant?

The following warning is written at the start of the section: As SDDM will be treated as a separate window by KWin, logging in will close the window. Therefore logging out or switching user will cause undesirable behaviour.

I personally don't experience any issues with SDDM version 0.20.0 and kwin_wayland when logging out. SDDM appears normally and is fully responsive, allowing a successful relogin. So the question came to me, whether this is actually still valid. Should this be removed? LittleHuba (talk) 19:11, 4 October 2023 (UTC)Reply

Can confirm, was a bug in 0.19 but was resolved with 0.20. Dungeonseeker (talk) 22:10, 4 October 2023 (UTC)Reply
Thanks, I removed the warning. — Lahwaacz (talk) 06:25, 7 October 2023 (UTC)Reply