Perry, yes, I'm still working on this to backport the patches to 3.19 kernel.
But, I can not successfully reproduce this issue on the machines I have.
Could you help to try if the kernel fix the issue?
http://people.canonical.com/~acelan/bugs/lp1646537/

The kernel is a little bit older than the latest one, 
so please make sure to boot the system with the right kernel.
Thanks.

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

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

Status in HWE Next:
  Fix Released
Status in HWE Next vivid series:
  New
Status in HWE Next xenial series:
  Fix Released
Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Xenial:
  Fix Released

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

  Steps:
  1. Install ubuntu 16.04 and boot into OS
  2. suspend system
  3. resume system from S3
  4. Try to adjust brightness level

  Expected results: Backlight should be changed when adjust it

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

To manage notifications about this bug go to:
https://bugs.launchpad.net/hwe-next/+bug/1625932/+subscriptions

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