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I've installed Ubuntu 12.04 on my Toshiba Satellite L645D and the screen brightness does not work, any suggestions??? please help!!

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This worked for me. – To Do Nov 7 '12 at 15:28

You might want to edit your xorg.conf configuration. In a terminal, type:

sudo cp /etc/X11/xorg.conf /etc/X11/xorg.conf.backup

This will make a backup of your xorg.conf file - just in case :) That being done, type:

gksudo gedit /etc/X11/xorg.conf

and under Section "Device" add the following line:

Option "RegistryDwords" "EnableBrightnessControl=1"

Save and reboot.

Perhaps this already does the trick. In that case, congratulations!

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