Workaround :
1- Install  xbacklight (sudo apt-get install xbacklight)
2- Disable password after screensaver has locked screen (in system settings / 
screen)
3- Create a keystroke shortcut to run "xbacklight -set 100" (in system settings 
/ keyboard /shortcut)
Now, when screen brightness is None, use the keystroke to switch the light on

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https://bugs.launchpad.net/bugs/883550

Title:
  LCD brightness NOT restored upon returning from screen lock in GNOME
  shell

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