Phoronix: AMD Intentionally Crippled Their HDMI Adapters
For some AMD Radeon graphics cards when using the Catalyst driver, the HDMI audio support isn't enabled unless using the simple DVI to HDMI adapter included with the graphics card itself... If you use another DVI-to-HDMI adapter, it won't work with Catalyst. AMD intentionally implemented checks within their closed-source driver to prevent other adapters from being used, even though they will work just fine...
I "used" to be an AMD fan because of their openness to OSS. Si i've had some AMD stuff recently to back that up. However, after the EXTREMELY horrible experience in attaching 2 monitors and 1 beamer to a 6870 card and days of frustration later i decided to completely ditch AMD for their crapiness drivers (yes, even on windows the mentioned setup was full with bugs!).
I won't discard AMD "forever", but for now and likely the coming years i'm completely done with their crap. That might change once the OSS support for the modern cards is fully up to par with catalyst (minus the intentional drm crap like this post)
This is clearly anti-consumer, anti-competitive and should be outlawed.
The shithead that came up with this / was responsible for putting it in, for the decision to put it in should be in prison.