diff --git a/lib/logitech/unifying_receiver/base.py b/lib/logitech/unifying_receiver/base.py
index e56242cb..6a0b7c50 100644
--- a/lib/logitech/unifying_receiver/base.py
+++ b/lib/logitech/unifying_receiver/base.py
@@ -277,6 +277,9 @@ def make_notification(devnumber, data):
 		# custom HID++1.0 battery events, where SubId is 0x07/0x0D
 		(sub_id in (0x07, 0x0D) and len(data) == 5 and data[4:5] == b'\x00')
 		or
+		# custom HID++1.0 illumination event, where SubId is 0x17
+		(sub_id == 0x17 and len(data) == 5)
+		or
 		# HID++ 2.0 feature notifications have the SoftwareID 0
 		(address & 0x0F == 0x00)
 		):
diff --git a/lib/logitech/unifying_receiver/status.py b/lib/logitech/unifying_receiver/status.py
index ce3577aa..8cd73dfc 100644
--- a/lib/logitech/unifying_receiver/status.py
+++ b/lib/logitech/unifying_receiver/status.py
@@ -308,6 +308,8 @@ class DeviceStatus(dict):
 			# however, this has not been fully verified yet
 			if n.sub_id in (0x07, 0x0D) and len(n.data) == 3 and n.data[2:3] == b'\x00':
 				return self._process_hidpp10_custom_notification(n)
+			if n.sub_id == 0x17 and len(n.data) == 3:
+				return self._process_hidpp10_custom_notification(n)
 		else:
 			# assuming 0x00 to 0x3F are feature (HID++ 2.0) notifications
 			try:
@@ -334,6 +336,12 @@ class DeviceStatus(dict):
 			self.set_battery_info(level, status)
 			return True
 
+		if n.sub_id == 0x17:
+			# message layout: 10 ix 17("address")  <??> <?> <??> <light level 1=off..5=max>
+			# TODO anything we can do with this?
+			_log.info("backlight event: %s", n)
+			return True
+
 		_log.warn("%s: unrecognized %s", self._device, n)
 
 	def _process_hidpp10_notification(self, n):