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

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

** Also affects: linux (Ubuntu Disco)
   Importance: Undecided
     Assignee: AceLan Kao (acelankao)
       Status: In Progress

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  Can't adjust brightness on DELL UHD dGPU AIO

Status in HWE Next:
Status in linux package in Ubuntu:
  In Progress
Status in linux source package in Bionic:
Status in linux source package in Cosmic:
Status in linux source package in Disco:
  In Progress

Bug description:
  The dell-uart-backlight driver has been loaded, but the backlight is 
controller by graphics driver instead of scalar IC. The old way to determinate 
weather the driver should be loaded is not working anymore, since the behavior 
of scalar command, show firmware version, is not the same as old platforms.

  Using more a reliable command, get_scalar_status, to check if scalar is in 
charge of the AIO backlight.

  Verified on new Dell AIO platforms.

  [Regression Potential]
  Expected. The get_scalar_status command is not supported by the first 
generation AIO platforms, so the driver may not be loaded on old AIO machines 
due to get_scalar_status command returns 0. To ease the pain, the "force" 
parameter has been introduced to make the driver can be loaded regardless of 
the return value of get_scalar_status command.

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