Many complaints and errors filed but no update to activate the feature.
To fix this, I opened /usr/bin/compiz (a wrapper script to start compiz) and edited the cards blacklist.
In my case I searched for my card using
$ lspci -nn | grep ATIThis gave me 1002:3150 as the card ID.
Delete this string from the blacklist (T).
Activating compiz, now works.