Hi,I’ve just installed latest ATI fglrx driver from ati repo,now OpenGL working (was using XRender). I installed CCSM as well,how to apply CCSM effect? My window manager is Kwin now,anything to change? 
To change, ‘Configure Desktop’ → ‘Default Applications’ → ‘Window Manager’
I’ve done that on a few systems and changed back to kwin each time. The few effects I care about have been added to kwin in kde4 and kwin is much less buggy.