On 06/22/2016 07:41 PM, Richard Shaw wrote:
I may have a look into this when I have time but I haven't noticed that this issue occurs during reboots but mythtv uses the sound device directly while chrome utilizes pulseaudio. Either way though, it should remember the setting between reboots. The only thing I can think of is that at some point it's choosing the device before the hdmi audio device is ready and reverting to the builtin audio but that's purely conjecture on my part.
If you won't have any use for the builtin audio, then try blacklisting the module for it.