(Solved)Unable to change back light on Ubuntu 14.04 on Samsung Laptop
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Below is a solution which worked on my Samsung laptop(NP510R5E)
cd /etc/default/sudo gedit grubIn the opening file, overwrite this line and save:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor"Run below command and reboot
sudo update-grub 0 0
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