backlight/eeepc-laptop: Update the backlight state when we change brightness

Trigger a status update when the user hits a brightness key, allowing
userspace to present appropriate UI.

Signed-off-by: Matthew Garrett <mjg@redhat.com>
Signed-off-by: Richard Purdie <rpurdie@linux.intel.com>
diff --git a/drivers/platform/x86/eeepc-laptop.c b/drivers/platform/x86/eeepc-laptop.c
index 222ffb89..7b5ee49 100644
--- a/drivers/platform/x86/eeepc-laptop.c
+++ b/drivers/platform/x86/eeepc-laptop.c
@@ -642,7 +642,7 @@
 	struct backlight_device *bd = eeepc_backlight_device;
 	if (bd) {
 		int old = bd->props.brightness;
-		bd->props.brightness = read_brightness(bd);
+		backlight_force_update(bd, BACKLIGHT_UPDATE_HOTKEY);
 		return old;
 	}
 	return -1;