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I'm using Ubuntu 13.04 on my Samsung NC110 notebook and the keys for the brightness aren't working. Can someone help me?

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This worked for me,

open a terminal.

sudo cp /etc/default/grub /etc/default/grub.bkup 
sudo gedit /etc/default/grub 

add the following to the line GRUB_CMDLINE_LINUX=".... acpiosi=Linux acpi_backlight=vendor "

sudo grub-mkconfig -o /boot/grub/grub.cfg 

hope this helps :-)

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