Gary, too bad, that looks like another bug in gnome-settings-daemon.
We already make sure that we can turn on/off the display through bl_blank in 
/sys/class/backlight/eeepc-wmi
So, everything in kernel are all set.
I just check the gnome-settings-daemon code and fount in 
plugins/media-keys/gsd-media-keys-manager.c +2126

        case KEYBOARD_BRIGHTNESS_UP_KEY:
        case KEYBOARD_BRIGHTNESS_DOWN_KEY:
        case KEYBOARD_BRIGHTNESS_TOGGLE_KEY:
                do_keyboard_brightness_action (manager, type);
                break;

And in do_keyboard_brightness_action(), it will call
        g_dbus_proxy_call (manager->priv->power_keyboard_proxy,
                           type == KEYBOARD_BRIGHTNESS_UP_KEY ? "StepUp" : 
"StepDown",
                           NULL,
                           G_DBUS_CALL_FLAGS_NONE,
                           -1,
                           NULL,
                           update_keyboard_cb,
                           manager);

You can easily find that, the brightness toggle type is gone. So that 
gnome-settings-daemon will do nothing while receiving the keyevent 431(which is 
KEY_DISPLAYTOGGLE).
I'll file a bug on bugzilla and link back to this bug tomorrow.

Thanks for your help.

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https://bugs.launchpad.net/bugs/1000146

Title:
  [ASUS X101CH and 1015CX] the hotkey to turn on/off the display is not
  working

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