Added initramfs script for setting backglight level on boot up

diff --git a/initramfs/backlight-level b/initramfs/backlight-level
new file mode 100755 (executable)
index 0000000..8d00c64
--- /dev/null
+++ b/initramfs/backlight-level
@@ -0,0 +1,49 @@
+#!/bin/sh
+
+###
+### This script is distributed in the terms of GNU GPL v3.0+
+### (c) Andrew Sichevoi, http://thekondor.net
+###
+### Name: backlight-level
+### Description: Initramfs script to setup initial display's backglight during the boot
+### Notes: The script should be run on 'local-top' stage
+###
+### Arguments
+###   name    : backlight_level
+###   type    : integer, [0..15]
+###   required: optional
+###   default : 10
+###
+
+PREREQ=""
+prereqs()
+{
+  echo "${PREREQ}"
+}
+
+case "${1}" in
+  prereqs)
+           exit 0;
+           ;;
+esac
+
+. /scripts/functions
+
+DEFAULT_BACKLIGHT_LEVEL=10
+BACKLIGHT_LEVEL=
+for arg in $(cat /proc/cmdline); do
+  case ${arg} in
+    backlight_level=*)
+                       BACKLIGHT_LEVEL=${arg#backlight_level=}
+                       ;;
+  esac
+done
+
+if [ -z ${BACKLIGHT_LEVEL} ]; then
+   log_warning_msg "Using default backlight level: '${DEFAULT_BACKLIGHT_LEVEL}'"
+   BACKLIGHT_LEVEL=${DEFAULT_BACKLIGHT_LEVEL}
+fi
+
+echo ${BACKLIGHT_LEVEL} > /sys/class/backlight/acpi_video0/brightness
+
+exit 0