diff --git a/arch/arm/mach-rk30/board-rk3066b-m701.c b/arch/arm/mach-rk30/board-rk3066b-m701.c
index f3f8b83a6053..cfdc6fc68ec3 100755
--- a/arch/arm/mach-rk30/board-rk3066b-m701.c
+++ b/arch/arm/mach-rk30/board-rk3066b-m701.c
@@ -285,6 +285,7 @@ static struct rk29_bl_info rk29_bl_info = {
 	.bl_ref = PWM_EFFECT_VALUE,
 	.io_init = rk29_backlight_io_init,
 	.io_deinit = rk29_backlight_io_deinit,
+	.min_brightness = 48,
 	.pwm_suspend = rk29_backlight_pwm_suspend,
 	.pwm_resume = rk29_backlight_pwm_resume,
 };