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[Why] Custom brightness curve works by walking through all data points one by one. When the brightness value is at either extreme this is a lot of data points to walk. This is especially noticeable when moving a brightness slider around how it can lag. [How] Bisect the data points to find the closest for interpolation. Reviewed-by: Alex Hung <alex.hung@amd.com> Signed-off-by: Mario Limonciello <mario.limonciello@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>