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[Andy Whitcroft <apw@xxxxxxxxxxxxx>]

** Also affects: linux (Ubuntu Xenial)
   Importance: Undecided
       Status: New

** Also affects: linux (Ubuntu Yakkety)
   Importance: Undecided
       Status: New

** Also affects: linux (Ubuntu Zesty)
   Importance: Undecided
       Status: New

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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
Status in linux source package in Xenial:
  Fix Committed
Status in linux source package in Yakkety:
  New
Status in linux source package in Zesty:
  New

Bug description:
  [Impact]
  There's no sysfs node for some Dell laptop keyboard backlight control.

  Two issues here:
  1. No sysfs "/sys/devices/platform/dell-laptop/leds/dell::kbd_backlight"
  The patch fixes the issue by adding necessary DMI string to dmi whitelist table:

  commit 8d2c4538dbc7154c4aed1364db127a0e51dbd459
  Author: Alex Hung <alex.hung@xxxxxxxxxxxxx>
  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 by updating timeout AC, if the model supports it:
  commit 9216e0dcb5533a999d544d0af8661118e0588e1d
  Author: Pali Rohár <pali.rohar@xxxxxxxxx>
  Date:   Sun Apr 23 21:40:47 2017 +0200

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

  [Test Case]
  On Dell Precision 3250 (Kabylake generation), the backlight cannot be controlled in sysfs, because it does not exist.
  With these two patches, keyboard backlight can be controlled in "/sys/devices/platform/dell-laptop/leds/dell::kbd_backlight".

  [Regression Potential] 
  The regression potential is low. Only newer Dell laptops will be affected, and it only applies to limited models.

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