And 2007 was 6 years ago now. The newest cards have always had issues with Linux. It did not matter who they were from. I usually go by the second newest generation of cards for Linux. Actually I look at last gen for my gaming use as well. Usually the last generation (6000 series for AMD in this case) has been out. The drivers have ha the bugs worked out. The cards are more stable for any OS use. I do not game on my Linux systems. The AMD 6670 I have works fine for what I am doing with it. I am not taxing the Linux system. It is basically a regular desktop with a little coding use and DVD ripping. The second account is used when people visit and they want a computer to use. The Linux machine is the one that is connected to the TV. I can't speak for sound over the HDMI cable. I have the computer's sound go straight to the surround sound system. The picture is fine. I have all my movies ripped and we watch them using the Linux system. I never get tired of the look on people's faces when I tell them the computer is running Linux not windows or OSX. I have had a few converts to Linux since for most of their needs Linux works fine.
On a side note I need to check on blue ray on Linux again. Be good to watch/rip blue ray movies. I do have all the movies that I rip. I just happen to have friends with little kids. They like to throw the disks around when we are not looking. I have picked up the pieces of a disk a number of times. Ripping the movies saves me from having to buy the movie again.