Fix the Brightness up/down Button on ubuntu 8.04 running on Compaq Presario V3000

Replace the contents in the following files given by the code given below.

Replace /etc/acpi/video_brightnessup.sh with the following code

#!/bin/bash

CURRENT=$(grep "current:" /proc/acpi/video/VGA/LCD/brightness |awk '{print $2}')


case "$CURRENT" in

100)
echo -n 100 > /proc/acpi/video/VGA/LCD/brightness;
;;
92)
echo -n 100 > /proc/acpi/video/VGA/LCD/brightness;
;;
84)
echo -n 92 > /proc/acpi/video/VGA/LCD/brightness;
;;
76)
echo -n 84 > /proc/acpi/video/VGA/LCD/brightness;
;;
68)
echo -n 76 > /proc/acpi/video/VGA/LCD/brightness;
;;
60)
echo -n 68 > /proc/acpi/video/VGA/LCD/brightness;
;;
52)
echo -n 60 > /proc/acpi/video/VGA/LCD/brightness;
;;
44)
echo -n 52 > /proc/acpi/video/VGA/LCD/brightness;
;;
36)
echo -n 44 > /proc/acpi/video/VGA/LCD/brightness;
;;
28)
echo -n 36 > /proc/acpi/video/VGA/LCD/brightness;
;;
20)
echo -n 28 > /proc/acpi/video/VGA/LCD/brightness;
;;

*) #default case
echo -n 68 > /proc/acpi/video/VGA/LCD/brightness ;
;;
esac

Replace /etc/acpi/video_brightnessdown.sh with

#!/bin/bash

CURRENT=$(grep "current:" /proc/acpi/video/VGA/LCD/brightness |awk '{print $2}')


case "$CURRENT" in

100)
echo -n 92 > /proc/acpi/video/VGA/LCD/brightness;
;;
92)
echo -n 84 > /proc/acpi/video/VGA/LCD/brightness;
;;
84)
echo -n 76 > /proc/acpi/video/VGA/LCD/brightness;
;;
76)
echo -n 68 > /proc/acpi/video/VGA/LCD/brightness;
;;
68)
echo -n 60 > /proc/acpi/video/VGA/LCD/brightness;
;;
60)
echo -n 52 > /proc/acpi/video/VGA/LCD/brightness;
;;
52)
echo -n 44 > /proc/acpi/video/VGA/LCD/brightness;
;;
44)
echo -n 36 > /proc/acpi/video/VGA/LCD/brightness;
;;
36)
echo -n 28 > /proc/acpi/video/VGA/LCD/brightness;
;;
28)
echo -n 20 > /proc/acpi/video/VGA/LCD/brightness;
;;
20)
echo -n 20 > /proc/acpi/video/VGA/LCD/brightness;
;;

*) #default case
echo -n 68 > /proc/acpi/video/VGA/LCD/brightness ;
;;
esac

for other laptops
run as root

 grep "levels:" /proc/acpi/video/VGA/LCD/brightness

And replace the brightness values in the files above.

:)