i have these function-keys problem, too. what i tried out is the follwing:

- edited the video_brightnessdown.sh and video_brightnessup.sh files
- filled with the values from /proc/acpi/video/NVID/LCD/brightness
- set the attributes to execute

then i tested the settings, and it stilld doesn’t work.
i found out that, when i am pressing the function-keys it affects the brighness-file (checked the current-value)

but the display is at maximum brightness and the current-values says: it is at 10! evertime i push the change-buttons the current-value changes, unfortunately not the real brightness of the display.
using the function-keys in a textconsole (STRG+ALT+F1) works.

is there any solution to this? or did i forgot anything?

95 43 20 24 28 32 37 43 50 59 69 81 95

Also, most people will probably not know that they have to make the scripts executable with:

sudo chmod a+x /etc/acpi/video_bright*

Otherwise it will definitely not work.

I have the same problem on my Fujitsu Amilo 2515 laptop. It looks to me as though the video_brightnessup & down scripts are not being called at all.

Anyway, as a quick workaround use the following script from a terminal window:

—————-

#!/bin/sh

if [ $# = 0 ]
then
bval=75
else
bval=$1
fi

echo ${bval} > /proc/acpi/video/GFX0/DD02/brightness

————

On my machine, valid values for brightness are: 13, 25, 38, 50, 63, 75, 88 , 100

If you invoke the script without a value, the brightness will be set to 75% which I find adequate for most environments.

First, type this command:

>> cat /proc/acpi/video/VGA/LCD/brightness

which will show on the screen something like this:

levels: 100 60 20 28 36 44 52 60 68 76 84 93 100
current: 100

Then change the brightness values in video_brightnessup.sh and video_brightnessdown.sh to match the values shown after the word ‘levels’ above.

Also, don’t forget to set the file permissions of video_brightnessup.sh and video_brightnessdown.sh so that they become executable.

Hope this works for you too!

Is it possible to share with us or you can submit as article to ubuntugeek

Thanks