How do xorg control the brightness?

Hello!
Although this happens in a laptop, it may be related to X conf, so i post here.
I'm playing with laptop-mode-tools as substitute of gnome-power-manager. All is fine, except the brightness of the LCD. Laptop mode is well configurated, as it changes to the brightness values i set. But, when xorg is up, it changes the brightness to 0%, so, it overwites the laptop-mode setup. This is no gnome related, because it happens too running a simple "X".
Nowadays, i have no xorg.conf, so, i don't know how to say X11 that can't change the brightness.
Any idea?
Thanks!!

err, what about installing xbacklight? (or something like that, I don't recall the name).
xbacklight can play very nicely with most laptops' backlight.

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How do xorg control the brightness?

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