I have the same problem it appeared suddenly in hardy heron although the video was working correctly before, maybe an update broke the situation. I am not sure.
** Attachment added: "lspci -vvnn" http://launchpadlibrarian.net/18868212/lspci -- First instance of video playback is corrupted, subsequent playback ok https://bugs.launchpad.net/bugs/182682 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs