Waybar starts before wlsunset (due to ExecStartPre sleep) and only checks the service status once. ExecStartPost sends SIGRTMIN+11 so waybar refreshes the nightlight module after wlsunset is ready.
Waybar starts before wlsunset (due to ExecStartPre sleep) and only checks the service status once. ExecStartPost sends SIGRTMIN+11 so waybar refreshes the nightlight module after wlsunset is ready.