Thanks for answering.

On Sun, Jul 26, 2020 at 2:49 PM Samuel Sieb <samuel@sieb.net> wrote:


More details about what "doesn't work" means would be helpful.  Do you
see a SPDIF option in the sound output settings?

In "pavucontrol", it actually does have a listing for the Xonar Sound Card, but only the analog output port is available. In alsamixer, I can press F6 to select sound card, and "Xonar Sound Card" is a selection, but there is no iec958 device. 

[mythtv@seveneves ~]$ aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: SoundCard [Xonar SoundCard], device 0: USB Audio [USB Audio]
  Subdevices: 0/1
  Subdevice #0: subdevice #0
card 0: SoundCard [Xonar SoundCard], device 1: USB Audio [USB Audio #1]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 0: SoundCard [Xonar SoundCard], device 2: USB Audio [USB Audio #2]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 0: SoundCard [Xonar SoundCard], device 3: USB Audio [USB Audio #3]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 1: PCH [HDA Intel PCH], device 0: ALCS1200A Analog [ALCS1200A Analog]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 1: PCH [HDA Intel PCH], device 3: HDMI 0 [HDMI 0]
  Subdevices: 0/1
  Subdevice #0: subdevice #0
card 1: PCH [HDA Intel PCH], device 7: HDMI 1 [HDMI 1]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 1: PCH [HDA Intel PCH], device 8: HDMI 2 [HDMI 2]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 1: PCH [HDA Intel PCH], device 9: HDMI 3 [HDMI 3]
  Subdevices: 1/1
  Subdevice #0: subdevice #0

[mythtv@seveneves ~]$ lspci
00:00.0 Host bridge: Intel Corporation Device 9b43 (rev 05)
00:02.0 VGA compatible controller: Intel Corporation Device 9bc5 (rev 05)
00:14.0 USB controller: Intel Corporation Device a3af
00:14.2 Signal processing controller: Intel Corporation Device a3b1
00:16.0 Communication controller: Intel Corporation Device a3ba
00:17.0 SATA controller: Intel Corporation Device a382
00:1b.0 PCI bridge: Intel Corporation Device a3ea (rev f0)
00:1d.0 PCI bridge: Intel Corporation Device a398 (rev f0)
00:1f.0 ISA bridge: Intel Corporation Device a3c8
00:1f.2 Memory controller: Intel Corporation Device a3a1
00:1f.3 Audio device: Intel Corporation Device a3f0
00:1f.4 SMBus: Intel Corporation Device a3a3
00:1f.6 Ethernet controller: Intel Corporation Ethernet Connection (12) I219-V
01:00.0 USB controller: ASMedia Technology Inc. ASM1042A USB 3.0 Host Controller
02:00.0 Non-Volatile memory controller: Intel Corporation SSD 660P Series (rev 03)

[mythtv@seveneves ~]$ lsusb
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 003 Device 002: ID 0b05:189d ASUSTek Computer, Inc. Xonar SoundCard
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 002: ID 051d:0002 American Power Conversion Uninterruptible Power Supply
Bus 001 Device 006: ID 0a5c:21e8 Broadcom Corp. BCM20702A0 Bluetooth 4.0
Bus 001 Device 005: ID 05e3:0610 Genesys Logic, Inc. 4-port hub
Bus 001 Device 008: ID 046d:c001 Logitech, Inc. N48/M-BB48/M-UK96A [FirstMouse Plus]
Bus 001 Device 003: ID 26ce:01a2 ASRock LED Controller
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

But it actually is a PCIe x1 card.

If I get into the audio settings in MythTV, it will show the iec958 device, but setting the audio to use it produces no sound.
 
That is really old information.  Probably the reason it's hard to find
anything more recent is because generally it all just works.

That's true for stereo sound, but not so true when you try to use surround sound and iec958 devices.

--Greg