The upstream bug
https://bugs.freedesktop.org/show_bug.cgi?id=97486

And the issue could be fixed by the following 2 commits in drm-intel-
next-queued.

commit 32b421e79e6b546da1d469f1229403ac9142d695
Author: Jani Nikula <jani.nik...@intel.com>
Date:   Mon Sep 19 13:35:25 2016 +0300

    drm/i915/backlight: setup and cache pwm alternate increment value

and

commit e29aff05f239f8dd24e9ee7816fd96726e20105a
Author: Shawn Lee <shawn.c....@intel.com>
Date:   Mon Sep 19 13:35:26 2016 +0300

    drm/i915/backlight: setup backlight pwm alternate increment on
backlight enable

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https://bugs.launchpad.net/bugs/1625932

Title:
  Backlight does not change when adjust it higher than 50% after S3

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