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drm/i915/backlight: Honor VESA eDP backlight luminance control capability

The VESA AUX backlight fails to be enable luminance based backlight
mainpulation becaused luminance_set is false by default.
Fix it by using luminance support control capabitliy.

Fixes: e13af5166a359 ("drm/i915/backlight: Use drm helper to initialize edp backlight")
Signed-off-by: Aaron Ma <aaron.ma@canonical.com>
Reviewed-by: Suraj Kandpal <suraj.kandpal@intel.com>
Signed-off-by: Suraj Kandpal <suraj.kandpal@intel.com>
Link: https://lore.kernel.org/r/20250823121647.275834-1-aaron.ma@canonical.com

authored by

Aaron Ma and committed by
Suraj Kandpal 72136efb 702fdf35

+1 -1
+1 -1
drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
··· 530 530 luminance_range->max_luminance, 531 531 panel->vbt.backlight.pwm_freq_hz, 532 532 intel_dp->edp_dpcd, &current_level, &current_mode, 533 - false); 533 + panel->backlight.edp.vesa.luminance_control_support); 534 534 if (ret < 0) 535 535 return ret; 536 536