4 files changed, 20 insertions, 13 deletions
diff --git a/perl-install/NEWS b/perl-install/NEWS
index 62302778f..98a1ceced 100644
--- a/perl-install/NEWS
+++ b/perl-install/NEWS
@@ -1,3 +1,5 @@
+- adapt drakdm and set_autologin for display-manager service, not prefdm (mga#22593)
+
 Version 18.3 - 12 Oct 2018
 
 - drakboot:
diff --git a/perl-install/any.pm b/perl-install/any.pm
index 13229965e..b12b9785f 100644
--- a/perl-install/any.pm
+++ b/perl-install/any.pm
@@ -770,15 +770,9 @@ sub get_autologin() {
         xfce4 => 'lightdm',
         LXDE => 'lxdm',
     );
-    my %dm_canonical = (
-        gnome => 'gdm',
-        plasma => 'sddm',
-    );
     my $dm =
-      lc($desktop{DISPLAYMANAGER}) ||
-      $desktop_to_dm{$desktop} ||
-      basename(chomp_(run_program::rooted_get_stdout($::prefix, "/etc/X11/lookupdm")));
-    $dm = $dm_canonical{$dm} if exists $dm_canonical{$dm};
+      basename(readlink("$::prefix/etc/systemd/system/display-manager.service")) =~ s/(.*)\.service/$1/r ||
+      $desktop_to_dm{$desktop};
 
     my $autologin_user;
     if ($dm eq "gdm") {
@@ -872,6 +866,7 @@ sub set_autologin {
     $desktop{DESKTOP} = $autologin->{desktop};
     $desktop{DISPLAYMANAGER} = $autologin->{dm};
     setVarsInSh($sys_conffile, \%desktop);
+    symlinkf("/usr/lib/systemd/system/$autologin->{dm}.service", "$::prefix/etc/systemd/system/display-manager.service");
 
     if ($autologin->{user}) {
 	my $home = (getpwnam($autologin->{user}))[7];
diff --git a/perl-install/install/NEWS b/perl-install/install/NEWS
index 1c715fecc..08ef72f32 100644
--- a/perl-install/install/NEWS
+++ b/perl-install/install/NEWS
@@ -1,3 +1,4 @@
+- adapt set_autologin for display-manager service, not prefdm (mga#22593)
 - drakx-in-chroot:
   o allow monitor-edid to be suppressed in post-install scriptlets
 
diff --git a/perl-install/standalone/drakedm b/perl-install/standalone/drakedm
index a8be26875..6e7d42304 100755
--- a/perl-install/standalone/drakedm
+++ b/perl-install/standalone/drakedm
@@ -47,8 +47,8 @@ if (!$::expert) {
     @list = grep { -e $_->{EXEC} } @list;
 }
 
-my ($dm_NAME) = cat_($cfg_file) =~ /^DISPLAYMANAGER=(.*)/m;
-my $dm = (find { uc($_->{NAME}) eq uc($dm_NAME) } @list) || $list[0];
+my $dm_name = basename(readlink("/etc/systemd/system/display-manager.service")) =~ s/(.*)\.service/$1/r;
+my $dm = (find { basename($_->{EXEC}) eq $dm_name } @list) || $list[0];
 
 start:
 if ($in->ask_from(N("Choosing a display manager"),
@@ -68,12 +68,21 @@ several different X sessions on your local machine at the same time.")),
       && $dm
    ) {
     $in->do_pkgs->ensure_is_installed($dm->{PACKAGE}, $dm->{EXEC}) or goto start;
-    addVarsInSh($cfg_file, { DISPLAYMANAGER => $dm->{NAME} });
-    log::explanations(qq(Switching to "$dm->{NAME}" display manager));
-    if (any::running_window_manager()) {
+    $dm_name = basename($dm->{EXEC});
+    addVarsInSh($cfg_file, { DISPLAYMANAGER => $dm_name });
+    symlinkf("/usr/lib/systemd/system/$dm_name.service", "$::prefix/etc/systemd/system/display-manager.service");
+    log::explanations(qq(Switching to "$dm_name" display manager));
+    # martinw: I can't find a way to get a clean switch between display managers when one is running.
+    # But keep the old code (to preserve the translations) in case someone else can.
+    my $can_switch_cleanly = 0;
+    if ($can_switch_cleanly && any::running_window_manager()) {
         $in->ask_yesorno('', N("The change is done, do you want to restart the dm service?"), 1) and
 				$in->ask_yesorno('', N("You are going to close all running programs and lose your current session. Are you really sure that you want to restart the dm service?"), 1) and
                       run_program::raw({ detach => 1 }, 'systemctl', 'restart', 'display-manager.service', '>', '/dev/null', '2>', '/dev/null');
+    } elsif (any::running_window_manager()) {
+        $in->ask_warn('', N("The change is done and will take effect when you next boot the system"));
+    } else {
+        run_program::run('systemctl', 'daemon-reload');
     }
 }