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Asus sTRX4 motherboards S/PDIF out issue

So i migrated from x299 to sTRX4 platform and out of the box hit issue.
Issue is with audio in optical S/PDIF output in both Windows and Linux.

Issue Windows:

  • audio stops working after playing few songs / video clips
  • when changing audio / video crackling / popping sound can be heard from speakers

Tested with both Windows and Asus drivers same result.

Issue Linux:

  • S/PDIF out doesn’t work

NOTE: Line OUT DO work correctly for both Windows and Linux.
S/PDIF out is connected to speakers Edifier 2.1 S350DB with build in DAC.

Tested motherboards:

ASUS ROG Zenith II Extreme
ROG Strix TRX40-E Gaming

Asking here because ASUS did not reply to my inquiry.

If anyone has MSI Creator / or other sTRX4 mobo connected via optical share with us if audio do works for You in Linux.

Linux - tested Debian 10 (stable and testing), Ubuntu latest, Mint 19.3 - audio on optical don’t work.

Assuming your on the latest bios?

Yes this was first thing I did. All TR boards on 0702 bios, Windows 1909 (updated from 1903 to bypass that new broken “search on type” “feature”).

x299 - worked fine.

All those motherboards use same codec S1220 with TR adding SupremeFX.

Because of the design of the HD audio portion of TRX40, it’s actually going through USB internally rather than through the HD audio onboard codecs, because TRX40 has no onboard HD audio codec. You’re better off using a working USB solution rather than the non-working USB solution trying to translate HD Audio interface data to USB and back.

This is something AMD missed when designing TRX40.

I know this limitation and on Linux is probably early adopters issue. I’m fine with that, meaning that I can wait for fix.

What I’m not fine with is Windows side of things and issue on optic out.
There is another thread regarding SupremeFX codec:


The fact that ASUS didn’t even reply to me suggests that they know issue and are quiet about it.

About missed in design for TRx40 - isn’t it cost saving appraoch ? Realtek has a deal with Intel so AMD doesn’t need to $$$ for patents etc. to support it natively ?

No, what’s more likely what happened is because this was the first time AMD designed their own Zen chipset (ASMedia was doing it for them for a while) they focused on Epyc more than consumer for that chipset. On Epyc, the focus is getting IPMI working flawlessly, rather than getting desktop user features like audio working.

I’m not convinced that this is AMD issue.

I contacted other user with Aorus Master and he have different codec on board, same problem with Linux aka. no support for optical but in Windows it works correctly.

On my end audio also works, but it works incorrectly and I tested 2 different SKU motherboards so IMO issue is with ASUS implementation of that SupremeFX chipset. Pass-through via USB interface is issue but it’s not issue that I’m experiencing on optical.

At this point my only option is to go with MSI or GB but honestly I do like that Zenith II board. I have option to get myself other board for testing but I don’t want to as I spend to much time on assembly HW then using it ;/

Anyway to me most plausible explanation is that it’s ASUS issue and it will be fixed over time. I can live without SPDIF but there are also other issues - SATA | USB 3 performance drop but that’s TR issue IMO.

I have a gigbyte Aorus master, just built the system last night. I can confirm the same behavior in Linux. Linux kernel sees the audio device but no sound out of the optical port.

 cat /proc/asound/cards                             
 0 [NVidia         ]: HDA-Intel - HDA NVidia
                      HDA NVidia at 0xb1080000 irq 166
 2 [Audio          ]: USB-Audio - USB Audio
                      Generic USB Audio at usb-0000:46:00.1-6, high speed
 3 [Audio_1        ]: USB-Audio - USB Audio
                      Generic USB Audio at usb-0000:46:00.3-5, high speed
 4 [Snowball       ]: USB-Audio - Blue Snowball
                      BLUE MICROPHONE Blue Snowball at usb-0000:23:00.3-, full speed
 5 [Schiit         ]: USB-Audio - I'm Fulla Schiit
                      Schiit Audio I'm Fulla Schiit at usb-0000:23:00.3-2.1.3, high speed
 6 [C920           ]: USB-Audio - HD Pro Webcam C920
                      HD Pro Webcam C920 at usb-0000:23:00.3-, high speed

lspci | grep -i audio
21:00.1 Audio device: NVIDIA Corporation GP104 High Definition Audio Controller (rev a1)
23:00.4 Audio device: Advanced Micro Devices, Inc. [AMD] Starship/Matisse HD Audio Controller
49:00.1 Audio device: NVIDIA Corporation GM204 High Definition Audio Controller (rev a1)

I am running Siduction (Debian Sid/Unstable), with Kernel 5.4.10.

On windows the spdif works fine with the gigabyte drivers. I am not sure if Linux is reporting the right boost frequencies. Other than that loving this build.