[mythtv-users] Slightly OT - audio switching to dummy

[Jim Abernathy]

On 10/11/20 6:13 AM, Jim Abernathy wrote:
> I have all my devices connected to my UHD 4K TV through a HDMI 2.0 
> switch. On my Xubuntu 20.04 PC I run a lot of media applications 
> including mythtv.
>
> One problem I have only on this system is losing audio devices when I 
> switch the TV away from the PC and later switching it back.
>
> I used to have a Video problem when switching but that seems to be 
> solved.
>
> However every time I switch back, audio is using device 'dummy'. I can 
> fix it by opening the mixer by clicking on the speaker/volume icon on 
> the top panel bar, and looking at all the devices under 
> Configuration.  They are all marked unavailable, but if I click on the 
> right one and wait 3 seconds it will turn available and I can selected 
> it.  The audio will now work.
>
> Is there a way in *ubuntu to force the audio to reset on a HDMI 
> connection event the same way that video does?
>
> BTW I'm using an Nvidia GT1030 card and it connected to the switch via 
> HDMI.
>
> Jim A


Yesterday I did a complete install of Ubuntu 20.04.1 LTS and had the 
same issue with the HDMI sound disappearing as an option when HDMI was 
switched away from the PC.  Later in the morning I got a bunch of 
updates many related to NVidia.  Once installed, the audio switching 
failure disappeared after several reboots and since I switch away the TV 
from the PC a lot, I think this may be fixed.  At least it worked 
yesterday afternoon and evening.

Jim A