** 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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https://bugs.launchpad.net/bugs/1813877
Title:
Can't adjust brightness on DELL UHD dGPU AIO
Status in HWE Next:
New
Status in linux package in Ubuntu:
In Progress
Status in linux source package in Bionic:
New
Status in linux source package in Cosmic:
New
Status in linux source package in Disco:
In Progress
Bug description:
[Impact]
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.
[Fix]
Using more a reliable command, get_scalar_status, to check if scalar is in
charge of the AIO backlight.
[Test]
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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