Who has installed the last Stability Update on the Samsung Galaxy S6 might have noticed that the notification LED is no longer illuminated. During the charging of the smartphone, or if you have an unread notification, the LED is off. The background to this is that the firmware update, for whatever reason, has deactivated this option.
So to the Notification LED must be simply re-enabled within the settings of the Samsung Galaxy S6. If you do not know how to do that, here's a quick guide:
1. Open from the Home screen of the Samsung Galaxy S6:
Menu --> Settings --> "Sounds & Notifications"
3. Scroll all the way down to "LED display "and activate the option by using the regulator. The notification LED will again light up as usual on your Samsung Galaxy.