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[Why] If the first data point for a custom brightness curve is not 0% luminance then the first few luminance values will be ignored. [How] Check signal is below first data point and if so do linear interpolation to 0 instead. Reviewed-by: Alex Hung <alex.hung@amd.com> Signed-off-by: Mario Limonciello <mario.limonciello@amd.com> Signed-off-by: Ivan Lipski <ivan.lipski@amd.com> Tested-by: Dan Wheeler <daniel.wheeler@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>