[SOLVED] Gnome brightness problem.

[caaarlos]

Hello,

I can't change my screen brightness. I'm using gnome 2, if I click on brightness applet on my gnome-panel, it's show me an error:

"https://www.dropbox.com/s/9f7ak765s16c5zx/Captura_de_tela.png"

The translation of my error is, "Cannot get laptop panel brightness"

I can't use the command "xbacklight" if I try it show me:

[caaarlos]

I used "radeontool light on" and reboot my system, now my video brightness is better, but the gnome brightness yet not work. But now without the error...

[chithanh]

Do you have ACPI_VIDEO enabled in your kernel? (and loaded if built as module)

[caaarlos]

Thank for the tip!

I followed this tutorial <http://www.gentoo.org/doc/en/power-management-guide.xml>