Frankly, I don't care if the support is open-source or proprietary. I don't care about games. All I want to do is to be able to display HD video (1080p) via HDMI in real time. Surely this is simple enough. And I know the hardware can do it under Linux, because it used to until AMD dropped support. The last proprietary driver was extremely flakey even in its day, and the only way to continue with it is to use obsolete kernels and Xorg.
This simply isn't good enough!
Intel can do it. All their drivers seem to be open-source. If I can find a non-touch screen 12" laptop with Intel inside, that will be my next purchase.