Still doesn't work in Saucy.  
For me, none of the following, cause any change in screen appearance, nor to 
they bring any response in lxterminal other than a new prompt:

xbacklight -get
xbacklight -set 100 -time 0
xbacklight -set 20 -time 0
xbacklight -set 2 -time 0

Running Saucy in plain openbox, no lxde other than lxterminal.

Also, as an aside, I think #4 may be misleading in saying "The xrandr program 
also works fine."
These commands work fine:
[code]
# Sets the "brightness" (i.e., thev transparency) of the LCD layer very dark:
xrandr --output VGA-0 --brightness 0.1
# Legitimate values are 0 to 1
# Sets the "brightness" (i.e., thev transparency) of the LCD layer all the way 
up:
xrandr --output VGA-0 --brightness 1
[/code]
but, unless I've misunderstood man xrandr they DO NOT affect the actual 
brightness of the backlight. In a well lit room, the effect looks very similar, 
but in a dark room the difference should be apparent.

It may be I haven't figured out the syntax correctly, but for me in Saucy, none 
of these do anything:
[code]
xrandr --output VGA-0 --set backlight 50
xrandr --output LVDS-0 --set backlight 50
xrandr --output --auto --set backlight 50
xrandr --output auto --set backlight 50
[/code]

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https://bugs.launchpad.net/bugs/1054298

Title:
  xbacklight doesn't work, but xrandr does and so does
  /sys/class/backlight

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