Yes, that's exactly as expected. Do you have cheese or another webcam application installed? What do they say when you unbind uvcvideo driver from "1-1.3:1.0"? Mine says - "No video device found" (or something similar).

I'm wondering how different the bus/device handling on two different machines can be when their logical arrangement seems same !

My laptop is an Asus X54C - SX261D by the way. Not that it matters.