Provide useful W530 scripts in bin/.

[config] / bin / w530_backlight.sh

diff --git a/bin/w530_backlight.sh b/bin/w530_backlight.sh
new file mode 100755 (executable)
index 0000000..bce6b30
--- /dev/null
+++ b/bin/w530_backlight.sh
@@ -0,0 +1,17 @@
+#!/bin/sh
+# A very primitive backlight setter with a hardcoded backlight path, to replace
+# xbacklight which currently does not work on my system.
+if ! echo "${1}" | egrep -q '^[0-9]+$'; then
+  echo 'Argument must be a number.'
+  exit 1
+fi
+percentage=${1}
+backlight_dir=/sys/class/backlight/intel_backlight
+max_brightness=$(cat "${backlight_dir}"/max_brightness)
+if [ "${percentage}" = '100' ]; then
+  sudo sh -c 'echo '"${max_brightness}"' > '"${backlight_dir}"'/brightness'
+else
+  fract=$(expr "${max_brightness}" / 100)
+  brightness=$(expr "${percentage}" \* "${fract}")
+  sudo sh -c 'echo '"${brightness}"' > '"${backlight_dir}"'/brightness'
+fi