added functions for brightness controls

.config/scripts/backlight_dec.sh

@@ -0,0 +1,13 @@
+#!/bin/sh
+b=$(cat /sys/class/backlight/amdgpu_bl0/brightness)
+
+a=0
+
+if [ $b -gt 0 ]; then
+  while [ $a -lt 10 -a $b -gt 0 ]; do
+    b=`expr $b - 1`
+    echo $b | sudo tee /sys/class/backlight/amdgpu_bl0/brightness
+    a=`expr $a + 1`
+  done
+fi
+

.config/scripts/backlight_inc.sh

@@ -0,0 +1,13 @@
+#!/bin/sh
+b=$(cat /sys/class/backlight/amdgpu_bl0/brightness)
+
+a=0
+
+if [ $b -lt 255 ]; then
+  while [ $a -lt 10 -a $b -lt 255 ]; do
+    b=`expr $b + 1`
+    echo $b | sudo tee /sys/class/backlight/amdgpu_bl0/brightness
+    a=`expr $a + 1`
+  done
+fi
+

.config/sxhkd/sxhkdrc

@@ -137,4 +137,8 @@ super + alt + shift + {h,j,k,l}
 super + {Left,Down,Up,Right}
 	bspc node -v {-20 0,0 20,0 -20,20 0}
 
+XF86MonBrightnessUp
+	$HOME/.config/scripts/backlight_inc.sh
 
+XF86MonBrightnessDown
+	$HOME/.config/scripts/backlight_dec.sh