Index: scripts/brightness_set.sh
===================================================================
diff -u -rd4988df80c5d03fe46e42c9563043ae281247278 -r01b9447a564c79628976078d442b8fa198adec97
--- scripts/brightness_set.sh	(.../brightness_set.sh)	(revision d4988df80c5d03fe46e42c9563043ae281247278)
+++ scripts/brightness_set.sh	(.../brightness_set.sh)	(revision 01b9447a564c79628976078d442b8fa198adec97)
@@ -21,6 +21,6 @@
     exit 0
 fi
 
-echo "$1" > /sys/class/backlight/backlight-mipi/brightness                                      # realtime
-echo "$1" > /var/lib/systemd/backlight/platform-backlight-mipi\:backlight\:backlight-mipi       # preserve for reboot
+echo "$1" | sudo tee /sys/class/backlight/backlight-mipi/brightness > /dev/null                                     # realtime
+echo "$1" | sudo tee /var/lib/systemd/backlight/platform-backlight-mipi\:backlight\:backlight-mipi > /dev/null      # preserve for reboot