I wanted to test VA API with my Lenovo T400s (GMA4500HD aka G45). You first need to install libva and then a libva-enabled mplayer. The only problem I have encountered is that the Debian package in the libva I downloaded disabled the i965 driver. I have reenabled it, it seems working. After installing, I found a small problem, reported on the Phoronix and the hkepc forums both: the skin of the people become blue. This can also be fixed easily.