Temporally I change the brightness of the notebook display with this way:First step 1.)
(for all these commands you need root privileges)
for the available steps for your Display.
You should get an output like this:
grki-prds grki # cat /proc/acpi/video/VGA/LCD/brightness
levels: 95 43 20 24 28 32 37 43 50 59 69 81 95
From "current: 0
" you can see the actual value for the brightness.
And from "levels: 95 ........" you can see the possible/compatible values.Second Step 2.)
Now you should test any value with this command:
echo "n" > /proc/acpi/video/VGA/LCD/brightness
The letter n stands for the value, in example with the number 69 :
echo "69" > /proc/acpi/video/VGA/LCD/brightness
With this way you can control the brightness of HP Pavilion notebooks of dv6000 series. I think it should also work with other notebooks too
This method works, but of course, it's not a permanent solution: reboot and it goes away.
Currently I'm "coding" for an elegant solution with a shell script in combination with "KlcdDimmer". (-> it is a KDE kicker applet, you can install "KlcdDimmer" with the package manager)