diff -up kde-workspace-4.11.22/kdm/kfrontend/kgreeter.cpp.500 kde-workspace-4.11.22/kdm/kfrontend/kgreeter.cpp
--- kde-workspace-4.11.22/kdm/kfrontend/kgreeter.cpp.500	2016-11-08 20:05:41.714961555 +0100
+++ kde-workspace-4.11.22/kdm/kfrontend/kgreeter.cpp	2016-11-08 20:09:04.938164314 +0100
@@ -405,7 +405,8 @@ KGreeter::insertUsers()
         for (setpwent(); (ps = getpwent()) != 0;) {
             if (*ps->pw_dir && *ps->pw_shell &&
                 (ps->pw_uid >= (unsigned)realLowUserId ||
-                 (!ps->pw_uid && _showRoot)) &&
+                 (!ps->pw_uid && _showRoot) ||
+                 (ps->pw_uid >= 500u && ps->pw_uid < (unsigned)_lowUserId && strcmp(ps->pw_dir, "/") != 0 && strncmp(ps->pw_dir, "/var/", 5) != 0 && strncmp(ps->pw_dir, "/run/", 5) != 0 && strcmp(ps->pw_shell, "/sbin/nologin") != 0 && strcmp(ps->pw_shell, "/usr/sbin/nologin") != 0 && strcmp(ps->pw_shell, "/bin/false") != 0 && strcmp(ps->pw_shell, "/usr/bin/false") != 0)) &&
                 ps->pw_uid <= (unsigned)_highUserId &&
                 !noUsers.hasUser(ps->pw_name) &&
                 !noUsers.hasGroup(ps->pw_gid))
@@ -424,7 +425,8 @@ KGreeter::insertUsers()
             for (setpwent(); (ps = getpwent()) != 0;) {
                 if (*ps->pw_dir && *ps->pw_shell &&
                     (ps->pw_uid >= (unsigned)realLowUserId ||
-                     (!ps->pw_uid && _showRoot)) &&
+                     (!ps->pw_uid && _showRoot) ||
+                     (ps->pw_uid >= 500u && ps->pw_uid < (unsigned)_lowUserId && strcmp(ps->pw_dir, "/") != 0 && strncmp(ps->pw_dir, "/var/", 5) != 0 && strncmp(ps->pw_dir, "/run/", 5) != 0 && strcmp(ps->pw_shell, "/sbin/nologin") != 0 && strcmp(ps->pw_shell, "/usr/sbin/nologin") != 0 && strcmp(ps->pw_shell, "/bin/false") != 0 && strcmp(ps->pw_shell, "/usr/bin/false") != 0)) &&
                     ps->pw_uid <= (unsigned)_highUserId &&
                     (users.hasUser(ps->pw_name) ||
                      users.hasGroup(ps->pw_gid)))