Porteus

I'm currently working on a power management for Porteus-2.0 and need a help from the community.
i would like to configure Porteus to reduce LCD brightness when laptop is running on battery and set maximum value when on AC.
(kde4 has powerdevil for this task but other DE's are lacking so we need to fill this gap)
unfortunately settings may differ between laptop brands thus i need to ask you for a help.

if you are an laptop owner then please post a result of following command: if you get an error saying 'file not found' then please post output of: thanks in advance.

HP Pavilion dv6 Notebook PC
cat /sys/class/backlight/acpi_video0/max_brightness
10

root@porteus:~# cat /sys/class/backlight/acpi_video0/max_brightness
15


Dell Latitude E6320

HP 6730S

ls -1 /sys/class/backlight
intel_backlight@

cat /sys/class/backlight/intel_backlight/brightness
3274965

I don't have powerdevil in my Toshiba Satellite and my output is
root@porteus:~# cat: /sys/class/backlight/acpi_video0/max_brightness: No such file or directory
The second output is
root@porteus:~# ls -1 /sys/class/backlight
radeon_bl@

EDIT: I did find some traces of powerdevil, but I dont know if it is complete:
root@porteus:~# find /usr -name powerdevil*
/usr/lib/kde4/powerdevilbrightnesscontrolaction_config.so
/usr/lib/kde4/powerdevildimdisplayaction_config.so
/usr/lib/kde4/powerdevildpmsaction.so
/usr/lib/kde4/powerdevildpmsaction_config.so
/usr/lib/kde4/powerdevilhandlebuttoneventsaction_config.so
/usr/lib/kde4/powerdevilrunscriptaction_config.so
/usr/lib/kde4/powerdevilsuspendsessionaction_config.so
/usr/share/apps/powerdevil
/usr/share/apps/powerdevil/powerdevil.notifyrc
/usr/share/kde4/services/kded/powerdevil.desktop
/usr/share/kde4/services/powerdevilactivitiesconfig.desktop
/usr/share/kde4/services/powerdevilbrightnesscontrolaction.desktop
/usr/share/kde4/services/powerdevildimdisplayaction.desktop
/usr/share/kde4/services/powerdevildpmsaction.desktop
/usr/share/kde4/services/powerdevilglobalconfig.desktop
/usr/share/kde4/services/powerdevilhandlebuttoneventsaction.desktop
/usr/share/kde4/services/powerdevilprofilesconfig.desktop
/usr/share/kde4/services/powerdevilrunscriptaction.desktop
/usr/share/kde4/services/powerdevilsuspendsessionaction.desktop
/usr/share/kde4/servicetypes/powerdevilaction.desktop
root@porteus:~#

Asus N61J
cat /sys/class/backlight/acpi_video0/max_brightness
15

Mac Book air
> cat /sys/class/backlight/acpi_video0/max_brightness
15

Toshiba Satellite A135-S4527

[olivares@E-213-5W tmp]$ cat /sys/class/backlight/acpi_video0/max_brightness
7
[olivares@E-213-5W tmp]$

as you can see numbers and adapters vary a lot so going with a static values makes no sense.
i'll make laptop-mode-tools to discover and use first entry found in /sys/class/backlight (in most cases it will be acpi_video0) and reduce brightness by 33% while on battery.
i hope it wont be too dark so if that's the case then please shout loud in rc1 feedback thread once rc1 ISO is released.

thanks a lot for the great feedback guys.

root@slax:~# cat /sys/class/backlight/acpi_video0/max_brightness
10
root@slax:~#

Lenovo B40 running slax remix v09