Really, if you want the best Linux/MythTV support, get an NVidia based board. I won't buy any motherboard right now that isn't based on NVidia 8xxx or 9xxx chipsets. They don't cost any more than any other boards and they work great with Linux and MythTV. You can even use VDPAU and move all the video decoding off to the GPU. If you are trying to re-use old hardware, either buy a new video card or a new motherboard for frontends. Backends and servers don't really use the video hardware much, so most anything will do. My old server was using an ancient ISA Trident VGA card. Did everything I needed it to do. The new server motherboard didn't have ISA slots or I might have put it in the new one too. Frontends are obviously more graphics intensive. :) <br>
<br>Hopefully, Intel and AMD/ATI will get the hint and give us decent drivers or specs so that the community can write their own. But for now, that's not the case. <br>