You really need to use Wikipedia and learn the capabilities of various video connections: DVI does not carry Audio. Only HDMI and displayport can. I can't believe that in All of Brazil there isn't an MDP to DP cable?!?
I could not believe that either.
In fact, I used two price comparison services (Google Shopping and Buscapé, which is the most popular here in Brazil), and none of them listed any MDP to DP cable.
The cable is also not available in any of the Brazilian large retail stores, all of which sell via the Internet (FastShop, Submarino, Americanas, Walmart, Extra, Saraiva, Shoptime, Ponto Frio, Casas Bahia, Ricardo Eletro, Magazine Luiza). It is not available at Apple online store as well (there is no Apple Store in São Paulo).
Then, I went to nine stores in three different shopping malls in São Paulo (including two Premium Apple resellers) and I was not able to find one single MDP to DP cable.
Then, I went to a large Fnac store at Paulista Avenue here in São Paulo and they told me they have never had such a cable. I went to two other stores in different neighborhoods here in São Paulo and such cable could not be found as well.
Then, I went to a street in São Paulo specialized in computers, consumer electronics and spent my whole Saturday there. In that street, I went to three stores specialized in Apple products, eight stores specialized in cables and adapters, and to countless other stores that sold computers, tablets, cell phones and other electronic devices. In every store, I was told that they had never seen such cable.
Believe me, I tried. It is incredible that in a city such as São Paulo, which is the largest city in Brazil and has a population of over 20 million people in the metropolitan area, such a cable could not be found. Perhaps there is such a cable somewhere in São Paulo, but I looked for it extensively and I could not find one. I simply cannot search every store in the city.
But then, again, just look at the demand. There is almost no demand for such a cable. It is needed to plug a 2560x1440 monitor to a Mac, and people hardly have those products here. They are expensive, and the huge taxes charged by the government makes it impossible for the vast majority of the population to afford such products. The cheapest Apple laptop costs about US$ 2,100 here, and it is an 11-inch MacBook Air. Everybody uses cheap plastic PCs equipped with outdated and/or low-end processors. The monitors are all TN and, at best, are full HD. Brazilian incredibly high taxes leaves a very sad landscape for consumer electronics here in Brazil. And the lack of such cable is a byproduct of this. I will continue to search for it. I will travel to Mexico City in two months and I will probably find it there. It is just sad that this cable may be readily available in Mexico City and it is so hard to find in São Paulo.
As for the audio output, I understand that the DVI port only allows video and not audio. However, there is also an USB cable connected to the dual-link DVI port. What is that for?
