When the TV that's plugged into my new HTPC is turned off, HDMI audio goes missing from the playback device list. The only remedy is to restart the computer with the TV on.
This same problem has been discussed a few times:
I'd like to know when we can expect a fix for this.
This is being handled by the engineering department and they are working hard to have the solution as soon as possible. As you said, this is an issue that has mentioned previously in other threads so my best recommendation is to keep track of the following thread: /thread/46315 https://communities.intel.com/thread/46315