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[Vanessa Chang <1381625@xxxxxxxxxxxxxxxxxx>]

Issue can be reproduced with below builds, please refer the results
below:

[Tested images for verification]
Stock 14.04.1 [ubuntu-14.04.1-desktop-amd64.iso] -> Failed
Stock 14.10 [ubuntu-14.10-desktop-amd64.iso] -> Failed
15.04 daily build @1/13 [vivid-desktop-amd64.iso] -> Failed

[Test Case / Reproduce Steps]
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

[Other Info]
1. For 14.04, due to bug#1332379, (https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1332379), the brightness cannot be adjusted after the system freshly installed. After adding kernel parameter "video.use_native_backlight=1" it then can work.
2. Test unit: Dell Haswell ULT system

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

Title:
  Adjust brightness to lowest value caused screen whole black

Status in OEM Priority Project:
  New
Status in linux package in Ubuntu:
  Incomplete

Bug description:
  When using F2 hotkey to adjust screen brightness to lowest value, it
  truns screen backlight off.

  Steps: 1. Press F2 to adjust screen brightness to lowest value

  Expected results: There is still screen backlight

  Actual results: Sceen backlight is turned off

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