Input: wacom - lower the LED luminance

The LED luminance level is normally lower when no button is pressed.
Reviewed-by: Eduard Hasenleithner <eduard@hasenleithner.at>
Tested-by: Eduard Hasenleithner <eduard@hasenleithner.at>
Signed-off-by: Ping Cheng <pingc@wacom.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

Documentation/ABI/testing/sysfs-driver-wacom

@@ -25,7 +25,8 @@ Contact:	linux-input@vger.kernel.org
 Description:
 		Writing to this file sets the status LED luminance (0..127)
 		when the stylus does not touch the tablet surface, and no
-		button is pressed on the stylus.
+		button is pressed on the stylus. This luminance level is
+		normally lower than the level when a button is pressed.
 
 What:		/sys/bus/usb/devices/<busnum>-<devnum>:<cfg>.<intf>/wacom_led/status1_luminance
 Date:		August 2011

drivers/input/tablet/wacom_sys.c

@@ -678,7 +678,7 @@ static int wacom_initialize_leds(struct wacom *wacom)
 
 		/* Initialize default values */
 		wacom->led.select = 0;
-		wacom->led.llv = 30;
+		wacom->led.llv = 10;
 		wacom->led.hlv = 20;
 		wacom->led.img_lum = 10;
 		wacom_led_control(wacom);