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drm/amd/display: Fix backlight control for luminance-capable OLED
[WHY] For some eDP panels VESA aux backlight control is necessary, otherwise they stay black. [HOW] When AUX backlight control is used, select BACKLIGHT_CONTROL_VESA_AUX for panels that advertise panel_luminance_control. Reviewed-by: Hansen Dsouza <hansen.dsouza@amd.com> Signed-off-by: Roman Li <Roman.Li@amd.com> Signed-off-by: Alex Hung <alex.hung@amd.com> Tested-by: Dan Wheeler <daniel.wheeler@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
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