Temps make it look like only one GPU is mining. Did you see the replies in that guide you posted?
I'm pretty sure that all 4 are mining, cgminer was able to set different values (intensity, for example) for each of 4 devices. I wrote the comment about "--adapter=ALL".
From reading other threads, I'm starting to think that the problem is the version of catalyst that I have installed. I tried rolling back the driver and installing 12.8 but I dorked something up and I'm reinstalling Ubuntu as I type.