@Ekimia
If you use utopic kernel and xserver 
(https://wiki.ubuntu.com/Kernel/LTSEnablementStack#Desktop) on 14.04.2 - it is 
a known issue. Please install that packages from trusty. If you use MATE - it 
may reset backlight levels on login because of bug in mate-power-manager.
I collect all known issues on my PPA page 
(https://launchpad.net/~nrbrtx/+archive/ubuntu/sysvinit-backlight).

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https://bugs.launchpad.net/bugs/1270579

Title:
  On laptops, screen brightness and keyboard backlight isn't memorized
  between sessions

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