Add descrption of cbacklight

README.md

@@ -5,4 +5,23 @@ Miscellaneous scripts used by Nico Schottelius
 ### cbacklight
 
 Sets/controls backlight using /sys/class/backlight/*/brightness
-directly. Usable for systems that use modesetting instead of intel driver.
+directly. Usable for systems that use modesetting instead of intel
+driver.
+
+Also: supports multiple backlight outputs at the same time.
+
+[14:12] line:~% cbackblight --help
+usage: cbackblight [-h] [--inc INC | --dec DEC | --set SET] [--get]
+
+cbacklight
+
+optional arguments:
+  -h, --help  show this help message and exit
+  --inc INC   Increment by percentage (points)
+  --dec DEC   Decrement by percentage (points)
+  --set SET   Set to percentage
+  --get       Get percentage (default)
+[14:12] line:~% cbackblight --inc 5
+[14:12] line:~% cbackblight --get
+intel_backlight: 72.17%
+[14:13] line:~%