How to Fix Missing HDMI Audio in Linux Using PipeWire

Step-by-Step Solution

Step 1: Restart PipeWire and WirePlumber User Services

Force an immediate hardware rescan across all connected display endpoints:

# Restart the PipeWire audio stack for the active user session
systemctl --user restart pipewire pipewire-pulse wireplumber

# Confirm active running status
systemctl --user status pipewire wireplumber --no-pager

Step 2: List Soundcards and Assign HDMI Profiles

Enumerate your audio hardware and assign the digital output profile:

# Inspect all audio cards and available profiles
pactl list cards

# Apply Digital Stereo HDMI profile to target GPU sound card
pactl set-card-profile alsa_card.pci-0000_01_00.1 output:hdmi-stereo

Step 3: Unmute HDMI Channels in ALSAmixer

Low-level ALSA driver defaults often initialize digital audio ports in a muted state:

1. 1

   Step 1

   Run alsamixer in your terminal.
2. 2

   Step 2

   Press F6 to choose your graphics card (HDA NVidia / HDA ATI / Intel HDMI).
3. 3

   Step 3

   Navigate to the S/PDIF or HDMI outputs.
4. 4

   Step 4

   If marked as MM (Muted), hit the M key to toggle to 00 (Unmuted).

Step 4: Set HDMI Sink as Global Default

Direct application audio streams to the HDMI endpoint:

# List available audio sinks
pactl list short sinks

# Set HDMI sink as system default
pactl set-default-sink alsa_output.pci-0000_01_00.1.hdmi-stereo

❓ Frequently Asked Questions (FAQ)

Why does HDMI audio vanish after waking from sleep?

Displays sleep their internal DACs when entering standby. Disable ALSA node autosuspension in WirePlumber configuration to maintain a persistent connection.

How do I test sound from the command line?

Run speaker-test -t wav -c 2 to verify immediate multi-channel stereo playback.