This bug was fixed in the package unity-settings-daemon - 15.04.1+16.04.20160701-0ubuntu2
--------------- unity-settings-daemon (15.04.1+16.04.20160701-0ubuntu2) xenial; urgency=medium
[ Kai-Heng Feng ] * power: Choose correct backlight device on laptops with hybrid graphics (LP: #1683445) Backported from gnome-settings-daemon commit ed7c2744
-- Sebastien Bacher <email address hidden> Tue, 03 Jul 2018 16:31:09 +0200
This bug was fixed in the package unity-settings- daemon - 15.04.1+ 16.04.20160701- 0ubuntu2
--------------- daemon (15.04. 1+16.04. 20160701- 0ubuntu2) xenial; urgency=medium
unity-settings-
[ Kai-Heng Feng ] daemon commit ed7c2744
* power: Choose correct backlight device on laptops with hybrid graphics
(LP: #1683445)
Backported from gnome-settings-
-- Sebastien Bacher <email address hidden> Tue, 03 Jul 2018 16:31:09 +0200