My system was working nicely (with respect to video and audio) until I have inserted an amd graphics card. I was using the onboard graphics chip before that. Now audio is not available. I have no idea how to get this working again. I hope I can get some help here:
What I find strange is this. The graphics card is an older model from AMD it has two DVI connectors. But lspci shows an hdmi audio device:
01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Cedar [Radeon HD 5000/6000/7350/8350 Series]
01:00.1 Audio device: Advanced Micro Devices, Inc. [AMD/ATI] Cedar HDMI Audio [Radeon HD 5400/6300 Series]