** Description changed:
[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.
+ For the old platforms which don't have the new command, I add a list to list
them all and use the old way to determinate the scalar IC.
[Test]
- Verified on new Dell AIO platforms.
+ Verified on old and new Dell AIO platforms.
[Regression Potential]
Low. The quirk lists all old platforms which use the old way to check if
scalar IC is in use. So, it won't change the behavior on old platforms, and
apply the new method on new platforms.
** Also affects: linux-oem (Ubuntu)
Importance: Undecided
Status: New
** No longer affects: linux (Ubuntu Cosmic)
** No longer affects: linux-oem (Ubuntu Cosmic)
** No longer affects: linux-oem (Ubuntu Disco)
** Also affects: linux (Ubuntu Eoan)
Importance: Undecided
Status: New
** Also affects: linux-oem (Ubuntu Eoan)
Importance: Undecided
Status: New
** No longer affects: linux-oem (Ubuntu Eoan)
** Also affects: linux-oem-osp1 (Ubuntu)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu)
Status: In Progress => Invalid
** Changed in: linux (Ubuntu)
Assignee: AceLan Kao (acelankao) => (unassigned)
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https://bugs.launchpad.net/bugs/1813877
Title:
Can't adjust brightness on DELL UHD dGPU AIO
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