Uh do you mean linux kernel released?

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

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

Status in HWE Next:
  New
Status in linux package in Ubuntu:
  Confirmed

Bug description:
  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 <[email protected]>
  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 <[email protected]>
  Date:   Sun Apr 23 21:40:47 2017 +0200

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

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