** Also affects: linux-oem-5.6 (Ubuntu Focal)
Importance: Undecided
Status: New
** Changed in: hwe-next
Assignee: (unassigned) => AaronMa (mapengyu)
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https://bugs.launchpad.net/bugs/1904991
Title:
[SRU][OEM-5.6] UBUNTU: SAUCE: Fix brightness control on BOE 2270 panel
Status in HWE Next:
New
Status in linux-oem-5.6 package in Ubuntu:
New
Status in linux-oem-5.6 source package in Focal:
New
Bug description:
[Impact]
BOE 2270 panel is used by several models of ThinkPads.
This brightness can not be controlled by default PWM.
[Fix]
The panel claims both PWM and AUX supports.
But actually PWM works on SDR mode, AUX works on HDR mode.
Intel i915 driver got a new SDR support to use PWM by maintainer, still in
upstream review.
To fix this on certain project, use a quirk first to fix this.
The maintainer's fix can be backported in future.
[Test Case]
Backlight brightness can be changed.
[Regression Potential]
Low,
Fix for specific panel ID, no effects for others.
Since this is temporary quirk, it will go to oem-5.6 only.
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