--- scripts/xflock4.orig	2019-05-10 20:05:58 UTC
+++ scripts/xflock4
@@ -39,12 +39,14 @@ done
 # else run another access locking utility, if installed
 for lock_cmd in \
   "xlock -mode blank" \
-  "slock"
+  "slock" \
+  "i3lock -c 000000"
   do
     set -- $lock_cmd
     if command -v -- $1 >/dev/null 2>&1; then
         $lock_cmd >/dev/null 2>&1 &
 	# turn off display backlight:
+        sleep 1
 	xset dpms force off
         exit
     fi