Public bug reported:
[Impact]
The get_scalar_status command was provided by ODM engineer and was newly
introduced to determinate whether scalar is responsible for the backlight
adjustment. That guy asked the scalar vendor to add this command and the
command works as expected. But there is already a command in the Dell AIO
scalar UART command spec. which can do the same thing since 2015, and the newly
introduced get_scalar_status command is undocumented. To prevent from
introducing regression in the future and to align with what Windows uses,
replace this command with get_display_mode command.
[Fix]
Replace get_scalar_status command with get_display_mode command.
[Test]
Verified on new Dell AIO platforms.
[Regression Potential]
Low, the command is already in the spec. since 2015.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Affects: linux-oem-osp1 (Ubuntu)
Importance: Undecided
Status: New
** Affects: linux (Ubuntu Bionic)
Importance: Undecided
Status: New
** Affects: linux-oem-osp1 (Ubuntu Bionic)
Importance: Undecided
Status: New
** Affects: linux (Ubuntu Eoan)
Importance: Undecided
Status: New
** Affects: linux (Ubuntu Focal)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Focal)
Importance: Undecided
Status: New
** Also affects: linux-oem-osp1 (Ubuntu Focal)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Eoan)
Importance: Undecided
Status: New
** Also affects: linux-oem-osp1 (Ubuntu Eoan)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Bionic)
Importance: Undecided
Status: New
** Also affects: linux-oem-osp1 (Ubuntu Bionic)
Importance: Undecided
Status: New
** No longer affects: linux-oem-osp1 (Ubuntu Eoan)
** No longer affects: linux-oem-osp1 (Ubuntu Focal)
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https://bugs.launchpad.net/bugs/1865402
Title:
Stop using get_scalar_status command in Dell AIO uart backlight driver
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