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[Kai-Heng Feng <kai.heng.feng@xxxxxxxxxxxxx>]

Yes, we can use that approach on unity-settings-daemon, with some minor
modification to make xbacklight works.

My intention to make it configurable is because there was a Braswell
laptop with a cheap panel, which needs at least 5% max brightness to
make it barely visible. For OEM projects, to solve problems like that, a
minimum brightness setting can be a generic and convenient way to make
preloaded Ubuntu more polished.

That being said, most panel works just fine with brightness value 1 in
my experience.

-- 
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https://bugs.launchpad.net/bugs/1381625

Title:
  Adjust brightness to lowest value caused screen whole black

Status in HWE Next:
  Confirmed
Status in Unity Settings Daemon:
  Fix Released
Status in linux package in Ubuntu:
  Confirmed
Status in unity-settings-daemon package in Ubuntu:
  Won't Fix

Bug description:
  [Impact]

  When adjusting screen brightness to lowest value, it turns screen
  backlight off.

  [Test Case]

  1. Install Image
  2. Press System's brightness hotkey to adjust the brightness level to the lowest or
  3. Go to System "Settings" -> "Brightness & Lock" to adjust brightness level to the lowest
  4. Check if the screen display still has backlight

  Expected results: There is still screen backlight

  Actual results: Sceen backlight is turned off

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