[Merge] lp:~fourdollars/ubuntu/trusty/gnome-desktop3/fix-lowest-brightness into lp:ubuntu/trusty-proposed/gnome-desktop3

[Shih-Yuan Lee]

Shih-Yuan Lee has proposed merging lp:~fourdollars/ubuntu/trusty/gnome-desktop3/fix-lowest-brightness into lp:ubuntu/trusty-proposed/gnome-desktop3.

Commit message:
Apply the similar method from the power plugin in unity-settings-daemon to fix the lowest brightness issue.

Requested reviews:
  Ubuntu branches (ubuntu-branches)
Related bugs:
  Bug #1381625 in unity-settings-daemon (Ubuntu Trusty): "Adjust brightness to lowest value caused screen whole black"
  https://bugs.launchpad.net/ubuntu/trusty/+source/unity-settings-daemon/+bug/1381625

For more details, see:
https://code.launchpad.net/~fourdollars/ubuntu/trusty/gnome-desktop3/fix-lowest-brightness/+merge/278110

Please help to review this change.
This change has been applied in xenial.
I am backporting it into trusty.
-- 
Your team Ubuntu branches is requested to review the proposed merge of lp:~fourdollars/ubuntu/trusty/gnome-desktop3/fix-lowest-brightness into lp:ubuntu/trusty-proposed/gnome-desktop3.
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