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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:e13af5166a("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 (cherry picked from commit72136efb87) Signed-off-by: Tvrtko Ursulin <tursulin@ursulin.net>