This bug was fixed in the package linux-oem - 4.15.0-1024.29

---------------
linux-oem (4.15.0-1024.29) bionic; urgency=medium

  * linux-oem: 4.15.0-1024.29 -proposed tracker (LP: #1797069)

  * Keyboard backlight sysfs sometimes is missing on Dell laptops (LP: #1797304)
    - platform/x86: dell-smbios: Correct some style warnings
    - platform/x86: dell-smbios: Rename dell-smbios source to dell-smbios-base
    - platform/x86: dell-smbios: Link all dell-smbios-* modules together
    - [Config] CONFIG_DELL_SMBIOS_SMM=y, CONFIG_DELL_SMBIOS_WMI=y
    - [Config] CONFIG_DELL_SMBIOS_SMM=y, CONFIG_DELL_SMBIOS_WMI=y

  [ Ubuntu: 4.15.0-38.41 ]

  * linux: 4.15.0-38.41 -proposed tracker (LP: #1797061)
  * Silent data corruption in Linux kernel 4.15 (LP: #1796542)
    - block: add a lower-level bio_add_page interface
    - block: bio_iov_iter_get_pages: fix size of last iovec
    - blkdev: __blkdev_direct_IO_simple: fix leak in error case
    - block: bio_iov_iter_get_pages: pin more pages for multi-segment IOs

 -- Chia-Lin Kao (AceLan) <acelan....@canonical.com>  Tue, 16 Oct 2018
10:32:03 +0800

** Changed in: linux-oem (Ubuntu Bionic)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1727235

Title:
  Dell new AIO requires a new uart backlight driver

Status in HWE Next:
  New
Status in OEM Priority Project:
  Triaged
Status in linux package in Ubuntu:
  Fix Released
Status in linux-oem package in Ubuntu:
  Invalid
Status in linux source package in Bionic:
  Fix Released
Status in linux-oem source package in Bionic:
  Fix Released

Bug description:
  [Impact]
  New Dell AIO platforms requires a driver that ​can communicate with the 
scalar IC FW through UART interface to get and set the brightness level.

  [Test]
  Verified on some new Dell machines and confirmed it works.

  [Fix]
  Write a new driver to handle this task.

  [Regression Potential]
  Low, it's a new driver for new interface.

  [Misc]
  Upstream maintainer ask use to re-implement this driver by the new 
  interface, serdev, but serdev seems doesn't work with ACPI, so submit 
  this driver as Ubuntu sauce patch for now. I'll try re-write it when I'm
  available.

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