I using Debian Lenny 5.
In my system don't work automatic lowering of the brightness, when the netbook 
switches to battery. I wrote event and script for acpi.
Here they are:

$ cat /etc/acpi/events/auto_brightness
# /etc/acpi/events/auto_brightness
# Called when ac off and we need to switch brightness down or up when ac on.
#
                                                                                
                                                                                
                 
event=ac_adapter.*                                                              
                                                                                
                 
action=/etc/acpi/auto_brightness.sh

$ cat /etc/acpi/auto_brightness.sh
#!/bin/bash                                                                     
                                                                                
                 
# /etc/acpi/auto_brightness.sh                                                  
                                                                                
                 
#                                                                               
                                                                                
                 
                                                                                
                                                                                
                 
. /usr/share/acpi-support/power-funcs                                           
                                                                                
                 
                                                                                
                                                                                
                 
getState

if [ "$STATE" = "AC" ]
then
        echo 15 > /sys/class/backlight/eeepc/brightness
else
        echo 1 > /sys/class/backlight/eeepc/brightness
fi


Best regards, Anton Kropachev
mailto: [email protected]

-- 
--
Just for fun (c) Linus Torwalds
-
Today is a good day to die...

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