type in the terminal:
sudo sed "s/\(GRUB_CMDLINE_LINUX=\)\"\"/\1\"acpi_osi=Linux acpi_backlight=vendor\"/" /etc/default/grub -i
then type:
sudo update-grub
then type:
sudo reboot
http://ubuntuforums.org/showthread.php?t=1972303
http://keyable.blogspot.com/2012/04/fix-screen-brightness-resets-to-lowest.html
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