Use 10% for brightness

config/home.nix

@@ -46,6 +46,7 @@ in {
         audacity
         autorandr
         brickstore
+        brightnessctl
         csharp-ls
         cups
         curl

config/packages/i3/config

@@ -56,6 +56,10 @@ bindsym XF86AudioPause exec playerctl play-pause
 bindsym XF86AudioNext exec playerctl next
 bindsym XF86AudioPrev exec playerctl previous
 
+# Use brightnessctl to adjust brightness
+bindsym XF86MonBrightnessUp exec brightnessctl set 10%+
+bindsym XF86MonBrightnessDown exec brightnessctl set 10%-
+
 # Use Mouse+$mod to drag floating windows to their wanted position
 floating_modifier $mod