But while the vmwgfx code in the kernel, in libdrm git and mesa git is probably good the stable X driver only uses a fallback on some legacy and the git X driver won't compile:
So I personally appreciate this. But I cannot even compile a necessary component...
While I never had a HD 42xx I have had a Pentium 4 (3ghz) with a radeon x300 (very low-end, even then) and I never had video playing problems there with xv. Only full hd was not always smooth, but that was CPU bound I guess.