[PATCH 0/1][SRU][OEM-5.6] UBUNTU: SAUCE: Fix brightness control on BOE 2270 panel

[Aaron Ma]

BugLink: https://bugs.launchpad.net/bugs/1904991

[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.

Aaron Ma (1):
  UBUNTU: SAUCE: drm/i915: Force DPCD backlight mode for BOE 2270 panel

 drivers/gpu/drm/drm_dp_helper.c | 1 +
 1 file changed, 1 insertion(+)

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2.28.0