Display manager cannot login to any desktop

Hello all, I am having trouble diagnose display manager problem. I can login to a shell via Ly, and execute Hyprland. However, ly failed to login to Hyprland (and gnome) directly. Here are some relevant configurations: /usr/share/wayland-sessions/hyprland.desktop [Desktop Entry] Name=Hyprland Comment=An intelligent dynamic tiling Wayland compositor Exec=Hyprland Type=Application systemctl and journalctl look OK to me. Any idea what could go wrong? Thanks!