Howtoforge posted a guide about installing the latest Intel Driver 2.12 on Ubuntu 10.04 (Lucid Lynx)

After a long time waiting the most interesting update of the Intel drivers for linux is now a fact. We can now have this great hardware acceleration for playing h.264 video. Or in other words we now have Hardware acceleration for HD content with our Intel video cards. As an owner of U400-138 with Intel 4500 MHD I have been waiting for this over a year but now I can play 720p without an issue. And so here is how to install this.

How To Install Latest Intel Driver 2.12 On Ubuntu 10.04 (Lucid Lynx)