control_brightness=1 # * if your system has the file /proc/acpi/video/vid/lcd/brightness (vid may # be vid1 or similar), use this file as brightness_output, and use # the command echo value. the possible values can be listed using the
control_brightness=1
# * if your system has the file /proc/acpi/video/vid/lcd/brightness (vid may 
# be vid1 or similar), use this file as brightness_output, and use 
# the command echo . the possible values can be listed using the 
# command: 
# 
# cat /proc/acpi/video/vid/lcd/brightness
# * if you have a file /sys/class/backlight/.../brightness, then you can use 
# that file as brightness_output, and the command echo . 
# 
# as far as i understand it the values are between 0 and 
# the value contained in the file /sys/class/backlight/.../max_brightness.