I want one where it reduces the screen's brightness, either by time or on demand (I don't mind). I have onboard Intel graphics. I don't want it to be like Redshift where it changes the screen's hue.
On a computer with Ubuntu 11.04 and onboard Intel graphics this works for me:
$ xrandr | grep connected | cut -f1 -d" "
VGA1
Use the output name found (in this case "VGA1") and adjust the brightness
$ xrandr --output VGA1 --brightness 0.7
Note, that the xrandr man page has this to say about the --brightness flag:
However, this is a software only modification, if your hardware has support to actually change the brightness, you will probably prefer to use xbacklight.
