to Андон Сикавица  :
try this in a terminal window:

sudo su -

This will give you root clearance on the shell .
then :

echo -n VALUE > /proc/acpi/video/VGA/LCD/brightness

where argument VALUE represents any these: 12, 25, 37, 50, 62, 75, 87,
or 100

for example a brightness level of 37 goes like this:
echo -n 37 > /proc/acpi/video/VGA/LCD/brightness

To quit the root terminal, type exit

-- 
Brightness Control doesn't work on Dell Vostro 1000
https://bugs.launchpad.net/bugs/159255
You received this bug notification because you are a member of Ubuntu
Bugs, which is the bug contact for Ubuntu.

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