diff --git a/xdm.changes b/xdm.changes
index 8a1df59..ee34c3d 100644
--- a/xdm.changes
+++ b/xdm.changes
@@ -1,3 +1,10 @@
+-------------------------------------------------------------------
+Fri Nov 19 16:12:35 UTC 2021 - Stefan Dirsch <sndirsch@suse.com>
+
+- %post: enable Xorg on s390x with virtio (Redhat PCI ID 1af4:1050)
+  via /etc/sysconfig/displaymanager on installation (but not upgrade)
+  by checking for existence of /dev/dri [JIRA#SLE-18632]
+
 -------------------------------------------------------------------
 Mon May 17 07:35:04 UTC 2021 - Dominique Leuenberger <dimstar@opensuse.org>
 
diff --git a/xdm.spec b/xdm.spec
index d69014e..66c895e 100644
--- a/xdm.spec
+++ b/xdm.spec
@@ -176,6 +176,16 @@ ln -s %{_sysconfdir}/alternatives/default-displaymanager %{buildroot}%{_prefix}/
 touch %{buildroot}%{_prefix}/lib/X11/displaymanagers/console
 
 %post
+# enable Xorg on s390x with virtio (Redhat PCI ID 1af4:1050) on installation (but not upgrade)
+if [ $1 -eq 1 ] ; then
+  if [ "$(arch)" == "s390x" ]; then
+    if [ -d /dev/dri ]; then
+      sed -i -e "s+DISPLAYMANAGER_REMOTE_ACCESS=.*+DISPLAYMANAGER_REMOTE_ACCESS=\"no\"+g" \
+             -e "s+DISPLAYMANAGER_STARTS_XSERVER=.*+DISPLAYMANAGER_STARTS_XSERVER=\"yes\"+g" \
+          %{_fillupdir}//sysconfig.displaymanager
+    fi
+  fi
+fi
 %service_add_post display-manager.service
 %{fillup_only -n displaymanager}
 %{_sbindir}/update-alternatives --install %{_prefix}/lib/X11/displaymanagers/default-displaymanager \