In Ubuntu and its derivative distros there is a common bug with saving settings the brightness of the laptop reboots and returns from sleep mode. My laptop is DNS with Linux Mint Mate and I also saw the following error. However in version 17.1 of such mistakes i did not see again.
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For those who have the problem with the brightness of the laptop, install the script through the terminal.
Installation into Linux Mint 14/15/16/17/17.1:
sudo add-apt-repository ppa:nrbrtx/sysvinit-backlight sudo apt-get update sudo apt-get install sysvinit-backlight