Public bug reported:

After an inactivity timeout, the screen backlight is powered off, but on 
activity (mouse, keystroke, etc)
the lamp is not switched on.

In the dark screen I can barely see the login page, and if I login, with the 
help of a torch I can turn the light on via the systray icon,
or via SSH from another machine writing to 
/sys/class/backlight/intel_backlight/brightness

Bug is in Ubuntu 15.04 and Ubuntu 15.10

** Affects: plasma-workspace (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1505246

Title:
  LCD backlight remains off

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