Add basic backlight brightness control without ui feedback

default_config.lua

@@ -107,6 +107,12 @@ config.keys.global_keys = {
 
         -- Previous track
         previousTrack = { {}, "XF86AudioPrev" },
+
+        -- Brightness up
+        brightnessUp = { {}, "XF86MonBrightnessUp" },
+
+        -- Brightness down
+        brightnessDown = { {}, "XF86MonBrightnessDown" },
     },
 
     -- Keyboard layout

simple/media_control.lua

@@ -32,6 +32,23 @@ function sendToSpotify(command)
     awful.util.spawn_with_shell("dbus-send --print-reply --dest=org.mpris.MediaPlayer2.spotify /org/mpris/MediaPlayer2 org.mpris.MediaPlayer2.Player." .. command)
 end
 
+-- Brightness control
+function getBrightness()
+    local handle = io.popen("xbacklight -get")
+    local brightness = handle:read("*a")
+    handle:close()
+    return brightness
+end
+
+function increaseBrightness()
+    os.execute("xbacklight -inc 2")
+end
+
+function decreaseBrightness()
+    os.execute("xbacklight -dec 2")
+end
+
+
 -- Volume control
 function getVolume()
     if isMuted() then return 0 end
@@ -208,7 +225,13 @@ function getKeys(config)
     hotkey.make(config.nextTrack, nextTrack,
         { description = "Next track", group = "media control" }),
     hotkey.make(config.previousTrack, previousTrack,
-        { description = "Previous track", group = "media control" })
+        { description = "Previous track", group = "media control" }),
+    
+    -- Backlight control
+    hotkey.make(config.brightnessUp, increaseBrightness,
+        { description = "Increase screen backlight brightness", group = "media control"}),
+    hotkey.make(config.brightnessDown, decreaseBrightness,
+        { description = "Decrease screen backlight brightness", group = "media control"})
 end
 
 return {