diff --git a/lib/logitech_receiver/hidpp20.py b/lib/logitech_receiver/hidpp20.py
index fd03da2e..5ab67008 100644
--- a/lib/logitech_receiver/hidpp20.py
+++ b/lib/logitech_receiver/hidpp20.py
@@ -210,9 +210,10 @@ class FeaturesArray(object):
 				indices = index.indices(len(self.features))
 				return [self.__getitem__(i) for i in range(*indices)]
 
-	def __contains__(self, value):
+	def __contains__(self, featureId):
+		"""Tests whether the list contains given Feature ID"""
 		if self._check():
-			ivalue = int(value)
+			ivalue = int(featureId)
 
 			may_have = False
 			for f in self.features:
@@ -220,8 +221,6 @@ class FeaturesArray(object):
 					may_have = True
 				elif ivalue == int(f):
 					return True
-				elif ivalue < int(f):
-					break
 
 			if may_have:
 				reply = self.device.request(0x0000, _pack('!H', ivalue))
@@ -231,17 +230,16 @@ class FeaturesArray(object):
 						self.features[index] = FEATURE[ivalue]
 						return True
 
-	def index(self, value):
+	def index(self, featureId):
+		"""Gets the Feature Index for a given Feature ID"""
 		if self._check():
 			may_have = False
-			ivalue = int(value)
+			ivalue = int(featureId)
 			for index, f in enumerate(self.features):
 				if f is None:
 					may_have = True
 				elif ivalue == int(f):
 					return index
-				elif ivalue < int(f):
-					raise ValueError("%r not in list" % value)
 
 			if may_have:
 				reply = self.device.request(0x0000, _pack('!H', ivalue))
@@ -250,7 +248,7 @@ class FeaturesArray(object):
 					self.features[index] = FEATURE[ivalue]
 					return index
 
-		raise ValueError("%r not in list" % value)
+		raise ValueError("%r not in list" % featureId)
 
 	def __iter__(self):
 		if self._check():
diff --git a/lib/logitech_receiver/notifications.py b/lib/logitech_receiver/notifications.py
index ac6df189..7a0d2664 100644
--- a/lib/logitech_receiver/notifications.py
+++ b/lib/logitech_receiver/notifications.py
@@ -127,7 +127,7 @@ def _process_hidpp10_custom_notification(device, status, n):
 		status.set_battery_info(charge, status_text)
 		return True
 
-	if n.sub_id == _R.illumination:
+	if n.sub_id == _R.keyboard_illumination:
 		# message layout: 10 ix 17("address")  <??> <?> <??> <light level 1=off..5=max>
 		# TODO anything we can do with this?
 		if _log.isEnabledFor(_INFO):
diff --git a/lib/solaar/cli/__init__.py b/lib/solaar/cli/__init__.py
index 1d2d25f5..b94029a7 100644
--- a/lib/solaar/cli/__init__.py
+++ b/lib/solaar/cli/__init__.py
@@ -76,10 +76,12 @@ _cli_parser, actions = _create_parser()
 print_help = _cli_parser.print_help
 
 
-def _receivers():
+def _receivers(dev_path=None):
 	from logitech_receiver import Receiver
 	from logitech_receiver.base import receivers
 	for dev_info in receivers():
+		if dev_path is not None and dev_path != dev_info.path:
+			continue
 		try:
 			r = Receiver.open(dev_info)
 			if _log.isEnabledFor(_DEBUG):
@@ -130,17 +132,23 @@ def _find_device(receivers, name):
 	raise Exception("no device found matching '%s'" % name)
 
 
-def run(cli_args=None):
+def run(cli_args=None, hidraw_path=None):
 	if cli_args:
 		action = cli_args[0]
 		args = _cli_parser.parse_args(cli_args)
 	else:
 		args = _cli_parser.parse_args()
+		# Python 3 has an undocumented 'feature' that breaks parsing empty args
+		# http://bugs.python.org/issue16308
+		if not 'cmd' in args:
+			_cli_parser.print_usage(_sys.stderr)
+			_sys.stderr.write('%s: error: too few arguments\n' % NAME.lower())
+			_sys.exit(2)
 		action = args.action
 	assert action in actions
 
 	try:
-		c = list(_receivers())
+		c = list(_receivers(hidraw_path))
 		if not c:
 			raise Exception('Logitech receiver not found')
 
diff --git a/lib/solaar/gtk.py b/lib/solaar/gtk.py
index f5bef6a8..16c8549f 100644
--- a/lib/solaar/gtk.py
+++ b/lib/solaar/gtk.py
@@ -42,6 +42,8 @@ def _parse_arguments():
 	arg_parser = argparse.ArgumentParser(prog=NAME.lower())
 	arg_parser.add_argument('-d', '--debug', action='count', default=0,
 							help='print logging messages, for debugging purposes (may be repeated for extra verbosity)')
+	arg_parser.add_argument('-D', '--hidraw', action='store', dest='hidraw_path', metavar='PATH',
+							help='unifying receiver to use; the first detected receiver if unspecified. Example: /dev/hidraw2')
 	arg_parser.add_argument('--restart-on-wake-up', action='store_true',
 							help='restart Solaar on sleep wake-up (experimental)')
 	arg_parser.add_argument('-V', '--version', action='version', version='%(prog)s ' + __version__)
@@ -81,7 +83,7 @@ def main():
 
 	args = _parse_arguments()
 	if not args: return
-	if args.action: return _cli.run(args.action)
+	if args.action: return _cli.run(args.action, args.hidraw_path)
 
 	_require('gi.repository', 'python-gi')
 	_require('gi.repository.Gtk', 'gir1.2-gtk-3.0')