Map keys to adjust volume and luminosity

Use keys on laptops that can be reached with the `fn` key

Install/Templates/i3/config

@@ -34,6 +34,15 @@ bindsym $mod+Shift+d exec dmenu_run
 # start dmenu for desktop applications
 bindsym $mod+d exec --no-startup-id i3-dmenu-desktop
 
+# adjust volume
+bindsym XF86AudioRaiseVolume exec amixer set Master unmute 2dB+
+bindsym XF86AudioLowerVolume exec amixer set Master unmute 2dB-
+bindsym XF86AudioMute exec amixer set Master unmute 0
+
+# adjust luminosity
+bindsym XF86MonBrightnessUp exec xbacklight + 2
+bindsym XF86MonBrightnessDown exec xbacklight - 2
+
 # change focus
 bindsym $mod+$left focus left
 bindsym $mod+$down focus down