Thanks for your replies. My laptop is packard bell ipower Q005. It's spec: cpu core 2 quad 9000, 4gb ddr3 ram, VGA geforce 9800M gts 1gb. I tried íntall the lastest driver of the card, enable full effect , reinstall compiz, or even install compiz manager simple, but it did not work. I install mandriva xtreme 3 but the burn effect did not work, don't know what happen.