https://bugs.freedesktop.org/show_bug.cgi?id=108036
--- Comment #2 from Kurt Kartaltepe notkurufu@cock.li --- The VA-API implementation correctly reports b-frames are unavailable and in this test they were not used.
The implemention also provided a decodable stream on main profile. So if the the firmware issue you describe affects main profile streams than this system is unaffected. And this is a separate issue.