Index: scripts/brightness_set.sh
===================================================================
diff -u -ra89b5249df072be403141463d7d88728b66a848e -rc80676d1306741023ddc4d82cc7ebd59305d11a0
--- scripts/brightness_set.sh	(.../brightness_set.sh)	(revision a89b5249df072be403141463d7d88728b66a848e)
+++ scripts/brightness_set.sh	(.../brightness_set.sh)	(revision c80676d1306741023ddc4d82cc7ebd59305d11a0)
@@ -6,4 +6,6 @@
     exit 0
 fi
 
-echo "$1" > /sys/class/backlight/backlight-mipi/brightness
+echo "$1" > /sys/class/backlight/backlight-mipi/brightness                                      # realtime
+echo "$1" > /var/lib/systemd/backlight/platform-backlight-mipi\:backlight\:backlight-mipi       # preserve for reboot
+