--- gdm-2.16.1/config/gdm.conf.in
+++ gdm-2.16.1/config/gdm.conf.in
@@ -362,7 +362,7 @@
 # large numbers of users and this feature should not be used in such
 # environments.  The setting of IncludeAll does nothing if Include is set to a
 # non-empty value.
-#IncludeAll=false
+IncludeAll=true
 # If user or user.png exists in this dir it will be used as his picture.
 #GlobalFaceDir=@datadir@/pixmaps/faces/