Need help to run SDDM in X11 rootless mode

[takagemacoed]

According to Arch Wiki and Gentoo Wiki, running SDDM as rootless mode is as easy as putting

[General]
DisplayServer=x11-user

in /etc/sddm.conf.

The corresponding setting for NixOS is like this

services.displayManager.sddm.settings.General.DisplayServer = "x11-user";

With above setting, when using Xorg, SDDM rootless can be run and verified by command ps -o user= -C X.

However when using XLibre, SDDM cannot be launch and it shows black screen with a static underline cursor at the top left corner. CTRL+ALT+1-9 have no response.

I am suspecting maybe I built XLibre with some missing essential mason flags, but I have no clue.

This is the build flags that I am using.

[takagemacoed]

Build xlibre-xserver with systemd_logind flag solved the issue.