I am trying to use this hardware:
0db0:d1d7 MSI PRO Z790-A WIFI
I see these two Alsa entries:
iec958:CARD=Audio,DEV=0
USB Audio, USB Audio
IEC958 (S/PDIF) Digital Audio Output
iec958:CARD=Audio,DEV=1
USB Audio, USB Audio #1
IEC958 (S/PDIF) Digital Audio Output
The first produces no sound, the 2nd when used with aplay -D produces
an error because the device does not exist. This seems to match alsa
choices in VLC.
This was from strace when running aplay -Diec958:CARD=Audio,DEV=1:
17528 openat(AT_FDCWD, "/dev/snd/controlC2", O_RDWR|O_CLOEXEC) = 3
17528 ioctl(3, SNDRV_CTL_IOCTL_PVERSION, 0x7fffa204941c) = 0
17528 ioctl(3, SNDRV_CTL_IOCTL_PCM_PREFER_SUBDEVICE, 0x7fffa204947c) = 0
17528 openat(AT_FDCWD, "/dev/snd/pcmC2D999p",
O_RDWR|O_NONBLOCK|O_CLOEXEC) = -1 ENOENT (No such file or directory)
17528 close(3) = 0
I do get sound via pipewire configured for either profile Pro or
surround 5.1, or surround 7.1. Pro works with USB Audio Pro #2, and
the other two have no choices and just say S/PDIF. But these settings
are received as two-channel by my receiver.
I saved the alsa-info.sh result here:
http://alsa-project.org/db/?f=a9b20dc9b3e29cf7545c6b61eca5411e717da085
John Klug
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