exit 0の前に
echo 2 | sudo tee /sys/class/backlight/*/brightness
を挿入する。
*の部分はパソコンによって違うので/sys/class/backlightの中に入っているもので輝度が変わるか試しておく。 ＜例＞
#!/bin/sh -e#
# rc.local
#
# This script is executed at the end of each multiuser runlevel.
# Make sure that the script will "exit 0" on success or any other
# value on error.
#
# In order to enable or disable this script just change the execution
# bits.
#
# By default this script does nothing.
echo 2 | sudo tee /sys/class/backlight/sony/brightness
exit 0