Thank you for reporting this bug to Ubuntu.
Ubuntu GNOME 16.04 (xenial) reached end-of-life on April, 2019
https://ubuntugnome.org/ubuntu-gnome-16-04-lts-is-here/
https://wiki.ubuntu.com/XenialXerus/ReleaseNotes/UbuntuGNOME
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** Tags added: backlight xenial
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https://bugs.launchpad.net/bugs/1520355
Title:
Backlight doesn't change in GNOME does in Unity
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