got brightness working on the laptop so now I can control that

.config/i3/arch-mac-lappy-config

@@ -257,6 +257,8 @@ bindsym XF86AudioMute exec --no-startup-id "pulseaudio-ctl mute ; pkill -RTMIN+1
 # bindsym XF86AudioPause exec --no-startup-id playerctl play-pause
 # bindsym XF86AudioPlayPause exec --no-startup-id playerctl play-pause
 bindsym $mod1+Shift+p exec --no-startup-id echo "cycle pause" > ~/.config/mpv/control
+bindsym XF86MonBrightnessUp exec --no-startup-id brightnessctl s +10%
+bindsym XF86MonBrightnessDown exec --no-startup-id brightnessctl s 10%-
 
 # Chrome special flags and others set in /etc/profiles.d/variables.sh like the following: --touch-devices=2 --force-device-scale-factor=2
 #