HDMI Audio not recognized

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Welcome to Manjaro forum

New users can only post inactive links (to prevent spam posts) like this:

https://wiki.archlinux.org/title/NVIDIA/Troubleshooting#No_audio_over_HDMI

New users are generally promoted to Basic users within 1 or 2 weeks and can access more forum functions, including posting links

Have you tried this from [Stable Update] 2021-09-24 announcement ?

nVidia 4xx PRIME on kernel >= 5.5 has no audio

If you are using an nVidia card with the proprietary prime driver and you get no audio through the HDMI port or the USB devices of the card don’t work it’s because they have been disable due to a power management bug in the kernel. This bug has been fixed in recent updates, so if you are running a kernel with version >= 5.5 and the 4xx version nVidia driver you can fix those problems by editing the file /etc/udev/rules.d/90-mhwd-prime-powermanagement.rules and commenting the following lines in this way.

  • To go from this:
# Remove NVIDIA USB xHCI Host Controller devices, if present
ACTION=="add", SUBSYSTEM=="pci", ATTR{vendor}=="0x10de", ATTR{class}=="0x0c0330", ATTR{remove}="1"

# Remove NVIDIA USB Type-C UCSI devices, if present
ACTION=="add", SUBSYSTEM=="pci", ATTR{vendor}=="0x10de", ATTR{class}=="0x0c8000", ATTR{remove}="1"

# Remove NVIDIA Audio devices, if present
ACTION=="add", SUBSYSTEM=="pci", ATTR{vendor}=="0x10de", ATTR{class}=="0x040300", ATTR{remove}="1"
  • to this:
# Remove NVIDIA USB xHCI Host Controller devices, if present
#ACTION=="add", SUBSYSTEM=="pci", ATTR{vendor}=="0x10de", ATTR{class}=="0x0c0330", ATTR{remove}="1"

# Remove NVIDIA USB Type-C UCSI devices, if present
#ACTION=="add", SUBSYSTEM=="pci", ATTR{vendor}=="0x10de", ATTR{class}=="0x0c8000", ATTR{remove}="1"

# Remove NVIDIA Audio devices, if present
#ACTION=="add", SUBSYSTEM=="pci", ATTR{vendor}=="0x10de", ATTR{class}=="0x040300", ATTR{remove}="1"
  • execute this:
sudo sed -Ei '/"0x040300"/s/^/#/' /etc/udev/rules.d/90-mhwd-prime-powermanagement.rules
sudo sed -Ei '/"0x0c8000"/s/^/#/' /etc/udev/rules.d/90-mhwd-prime-powermanagement.rules
sudo sed -Ei '/"0x0c0330"/s/^/#/' /etc/udev/rules.d/90-mhwd-prime-powermanagement.rules
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