[SOLVED] Audio only coming from HDMI

[bifferos]

My system was working perfectly for some time (> 1 year actually) however just recently it's switched to HDMI audio and I can't seem to get it back to HD-Audio, the built-in motherboard audio which I want. The motherboard is ASRock B450M Pro4.

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$ lspci | grep Audio
07:00.1 Audio device: NVIDIA Corporation GK208 HDMI/DP Audio Controller (rev a1)
09:00.4 Audio device: Advanced Micro Devices, Inc. [AMD] Starship/Matisse HD Audio Controller

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$ dmesg | grep audio
[    5.461976] snd_hda_intel 0000:07:00.1: Handle vga_switcheroo audio client
[    5.476871] snd_hda_codec_realtek hdaudioC1D0: autoconfig for ALC892: line_outs=1 (0x14/0x0/0x0/0x0/0x0) type:line
[    5.476873] snd_hda_codec_realtek hdaudioC1D0:    speaker_outs=0 (0x0/0x0/0x0/0x0/0x0)
[    5.476873] snd_hda_codec_realtek hdaudioC1D0:    hp_outs=1 (0x1b/0x0/0x0/0x0/0x0)
[    5.476874] snd_hda_codec_realtek hdaudioC1D0:    mono: mono_out=0x0
[    5.476874] snd_hda_codec_realtek hdaudioC1D0:    inputs:
[    5.476875] snd_hda_codec_realtek hdaudioC1D0:      Front Mic=0x19
[    5.476876] snd_hda_codec_realtek hdaudioC1D0:      Rear Mic=0x18
[    5.476877] snd_hda_codec_realtek hdaudioC1D0:      Line=0x1a
[ 1247.477578] snd_hda_codec_hdmi hdaudioC0D0: HDMI: invalid ELD data byte 25
[ 1253.801488] snd_hda_codec_hdmi hdaudioC0D0: HDMI: invalid ELD data byte 1

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$ aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: NVidia [HDA NVidia], device 3: HDMI 0 [HDMI 0]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 0: NVidia [HDA NVidia], device 7: HDMI 1 [HDMI 1]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 0: NVidia [HDA NVidia], device 8: HDMI 2 [HDMI 2]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 0: NVidia [HDA NVidia], device 9: HDMI 3 [HDMI 3]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 0: NVidia [HDA NVidia], device 10: HDMI 4 [HDMI 4]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 1: Generic [HD-Audio Generic], device 0: ALC892 Analog [ALC892 Analog]
  Subdevices: 1/1
  Subdevice #0: subdevice #

pavucontrol is only showing a single device (the HDMI).

Any ideas?
Thanks!

[Hoser Rob]

I've never had any real audio problems so I don't think I'd be able to solve this, but I do know that the MB make/model isn't enough general system info.

Copy/paste the text output of inxi -Fxxxrz run in the terminal.

[Pierre]

when running from an LinuxMint system,
into an desktop projector, via an HDMI cable,
it's often the video that works, and Not the sound from that HDMI cable.

the fix was to correct the audio feed in the Sound Output Icon in the Taskbar.

[bifferos]

Here's the output from inxi

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$ inxi -Fxxxxrz
System:
  Kernel: 5.4.0-58-generic x86_64 bits: 64 compiler: gcc v: 9.3.0 
  Desktop: Cinnamon 4.8.5 wm: muffin 4.8.0 dm: LightDM 1.30.0 
  Distro: Linux Mint 20.1 Ulyssa base: Ubuntu 20.04 focal 
Machine:
  Type: Desktop Mobo: ASRock model: B450M Pro4 serial: <filter> 
  UEFI: American Megatrends v: P5.30 date: 08/04/2021 
CPU:
  Topology: 8-Core model: AMD Ryzen 7 3700X bits: 64 type: MT MCP arch: Zen 
  L2 cache: 4096 KiB 
  flags: avx avx2 lm nx pae sse sse2 sse3 sse4_1 sse4_2 sse4a ssse3 svm 
  bogomips: 115200 
  Speed: 2201 MHz min/max: 2200/3600 MHz boost: enabled Core speeds (MHz): 
  1: 2197 2: 2198 3: 2200 4: 2199 5: 2200 6: 2194 7: 2199 8: 2200 9: 2201 
  10: 2200 11: 2199 12: 2198 13: 2200 14: 2200 15: 2199 16: 2200 
Graphics:
  Device-1: NVIDIA GK208B [GeForce GT 710] vendor: Micro-Star MSI 
  driver: nvidia v: 460.39 bus ID: 07:00.0 chip ID: 10de:128b 
  Display: x11 server: X.Org 1.20.8 driver: nvidia 
  unloaded: fbdev,modesetting,nouveau,vesa resolution: 2560x1440~60Hz 
  OpenGL: renderer: GeForce GT 710/PCIe/SSE2 v: 4.6.0 NVIDIA 460.39 
  direct render: Yes 
Audio:
  Device-1: NVIDIA GK208 HDMI/DP Audio vendor: Micro-Star MSI 
  driver: snd_hda_intel v: kernel bus ID: 07:00.1 chip ID: 10de:0e0f 
  Device-2: AMD Starship/Matisse HD Audio vendor: ASRock 
  driver: snd_hda_intel v: kernel bus ID: 09:00.4 chip ID: 1022:1487 
  Sound Server: ALSA v: k5.4.0-58-generic 

[bifferos]

I finally figured this one out today. In the BIOS, I played around with the onboard devices configuration.

Not Working:
Turn on LED in S5: Enabled
Gnb Hd Audio: Enabled
- Front Panel: HD
Restore on AC Power Loss: Power Off

Working:
Turn on LED in S5: Enabled
Gnb Hd Audio: Enabled
- Front Panel: AC 97
Restore on AC Power Loss: Power Off

In other words, switching from Front Panel HD -> AC97 fixed the problem and my audio now works out of the on-board card.

This problem is not specific to Mint, I found the same behaviour with MX Linux.

What may have been significant here is that I recently patched the BIOS. I'm certain that this motherboard wasn't fussy about that setting before, in fact I think I had the Gnb Hd Audio on 'auto'. So please bear this in mind if you patch your ASRock B450M Pro4 BIOS. Maybe they'll fix this in a future patch.