Public bug reported:

Two issues here:
1. No sysfs "/sys/devices/platform/dell-laptop/leds/dell::kbd_backlight"
The patch fixes the issue:
commit 8d2c4538dbc7154c4aed1364db127a0e51dbd459
Author: Alex Hung <alex.h...@canonical.com>
Date:   Thu Feb 16 20:58:03 2017 +0800

    platform/x86: dell-laptop: Add Latitude 7480 and others to the DMI
whitelist

2. The sysfs exits, but backlight cannot be controlled by "brightness" 
attribute.
The patch fixes the issue:
commit 9216e0dcb5533a999d544d0af8661118e0588e1d
Author: Pali Rohár <pali.ro...@gmail.com>
Date:   Sun Apr 23 21:40:47 2017 +0200

    platform/x86: dell-laptop: Add keyboard backlight timeout AC
settings

** Affects: hwe-next
     Importance: Undecided
         Status: New

** Affects: linux (Ubuntu)
     Importance: Undecided
     Assignee: Kai-Heng Feng (kaihengfeng)
         Status: Confirmed


** Tags: originate-from-1689427 somerville

** Tags added: originate-from-1689427 somerville

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https://bugs.launchpad.net/bugs/1693126

Title:
  Keyboard backlight control does not work on some dell laptops.

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