Add backlight control to i3

.config/i3/blocks/backlight

@@ -0,0 +1,21 @@
+#!/bin/sh
+
+# Set how much you want the brightness to change
+DELTA=2
+
+# Get the current light level, rounded to an integer
+LIGHT=$(printf '%.*f' 0 $(xbacklight -get))
+NEW_LIGHT=$LIGHT
+
+# If called from i3blocks, and scrolling, then change light level
+case $BLOCK_BUTTON in
+	5) NEW_LIGHT=$(expr $LIGHT + $DELTA) ;;
+	4) NEW_LIGHT=$(expr $LIGHT - $DELTA) ;;
+esac
+
+xbacklight -set $NEW_LIGHT -time 0 -steps 1
+
+# Output the new light level
+OUTPUT=$(printf '%.*f%%' 0 $(xbacklight -get))
+echo $OUTPUT
+echo $OUTPUT

.config/i3/blocks/battery

@@ -75,8 +75,6 @@ switch($ENV{BLOCK_BUTTON} || 0) {
             }
         }
     }
-    case "4" { system("light -U -l 1") }
-    case "5" { system("light -A -l 1") }
 }
 
 

.config/i3/blocks/config

@@ -77,6 +77,11 @@ interval=10
 label=
 interval=10
 
+[backlight]
+label=
+interval=30
+signal=12
+
 [separator]
 
 [rotation]