Sddm display manager doesn't work on NixOS 21.11, nixos-unstable

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3

I just replaced

services.xserver.displayManager.gdm.enable = true;
services.xserver.desktopManager.gnome.enable = true;

with this:

  services.xserver.displayManager.sddm.enable = true;
  services.xserver.desktopManager.plasma5.enable = true;

I tried the similar configuration on my another laptop (Dell G5 15 5590) and worked without issues, so this issue might be something specific to Matebook E’s hardware… I will test if it even boot from KDE version of NixOS live USB.