RTX 2060 Mobile audio device only temporarily available

My endeavor began trying to get a display output via my HDMI port. At least this part, I was able to solve via an X org configuration. The file is accessible in the nvidia-bug-report.log.gz on line 3844.

While I tested the setup, I noticed that I could not select the connected device as an audio output. My research led my to this forum thread that discussed this issue. First, I followed the steps outlined in the as solved marked post. Yet I could not get the audio device to show up in lspci.

To try another way to do the same thing, I installed the nvhda kernel module found here. Sadly, that did not fix it either.

So I went locking through my kernel log. In there I at least found evidence, that the audio device exist (I wasn’t sure about that which might be a little dumb). nvhda was also able to set the magic bits, at least sometimes. It finds and losses the graphics cards a couple of times during boot up, though that is probably not the issue.

Further down the log, I found something that looks suspicious to me. I copy the segment here, but you can also find it on line 7608.

[ 497.428551] input: HDA NVidia HDMI/DP,pcm=3 as /devices/pci0000:00/0000:00:01.1/0000:01:00.1/sound/card1/input23 [ 497.428615] input: HDA NVidia HDMI/DP,pcm=7 as /devices/pci0000:00/0000:00:01.1/0000:01:00.1/sound/card1/input24 [ 497.428662] input: HDA NVidia HDMI/DP,pcm=8 as /devices/pci0000:00/0000:00:01.1/0000:01:00.1/sound/card1/input25 [ 497.428743] input: HDA NVidia HDMI/DP,pcm=9 as /devices/pci0000:00/0000:00:01.1/0000:01:00.1/sound/card1/input26 [ 497.428793] input: HDA NVidia HDMI/DP,pcm=10 as /devices/pci0000:00/0000:00:01.1/0000:01:00.1/sound/card1/input27 [ 497.428841] input: HDA NVidia HDMI/DP,pcm=11 as /devices/pci0000:00/0000:00:01.1/0000:01:00.1/sound/card1/input28 [ 497.630568] pci 0000:01:00.1: Removing from iommu group 10

To me that looks as if the audio device of my graphics cards gets recognized and properly setup. But afterwards, for some reason, it gets removed by something.

Is someone able to tell why, or can point me in a direction where I can investigate further?

If you need further information, I am happy to supply them,
and thank you for reading the whole post.

LOG: nvidia-bug-report.log.gz (262.1 KB)
Note that the second display device was plugged in while my Laptop booted.