** Description changed:

- New Dell AIO platforms requires a driver that ​can communicate with the
- scalar IC FW by UART interface to get and set the brightness level.
+ 
+ [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.

** Description changed:

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

Title:
  Dell new AIO requires a new uart backlight driver

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