How to change the brightness when the brightness control doesn't work.

$ xrandr --prop | grep " connected"

You will get something like

LVDS-0 connected primary 1280.800+0+0

LVDS-0 is the name of the display that we like to adjust the brightness for. On your system, it might have another name.

Now we want to get the current brightness:

$ xrandr --prop --verbose | grep -A10 " connected" | grep "Brightness"

1.0

Let us adjust the brightness to 40% (0.4)

$ xrandr --output LVDS-0 --brightness 0.4

You should see the brightness change. Now let us read the current brightness

$ xrandr --prop --verbose | grep -A10 " connected" | grep "Brightness"

0.4

Note that on my computer, the brightness keys doesn't work. I am trying to look for a solution.

techamad