Public bug reported:

After updating to Ubuntu 16.04 from 14.04, on my Lenovo T420s, the
screen is very dim after resuming from standby. Changing the brightness
by settings or fn keys restores the correct state.

This is very annoying because it is a repeating regression that happens
again and again over the last years. Almost every distribution upgrade
breaks the brightness after standby and took some month or even years to
have it working correct again.

** Affects: xserver-xorg-video-intel (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1615420

Title:
  Regression: Low screen brightness after standby

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