Sound Setup

Chapter 8 — Configuring Sound

Sound on Linux works well on most hardware straight out of the box — but when it doesn't, it can be confusing because the audio stack has several layers with unfamiliar names. This chapter explains how Linux handles audio, how to use the graphical sound settings, how to switch output devices (including HDMI and Bluetooth), and how to diagnose and fix the most common sound problems.

1. How Linux Handles Audio — The Stack

Linux audio goes through several layers between an application and your speakers. Understanding these layers makes troubleshooting much easier.

When you adjust the volume slider in your desktop's settings panel, you're controlling the sound server. When audio is completely absent, the problem is usually either at the ALSA level (wrong device selected, muted) or at the sound server level (service not running, wrong output selected).

2. PulseAudio vs PipeWire

There are two sound servers in common use on Linux. Which one you have depends on your distro and how recently it was released.

Checking what's running

3. Graphical Sound Settings

For everyday audio management you rarely need the terminal. Every major desktop environment has graphical sound controls.

Ubuntu (GNOME) — Settings → Sound

Open Settings → Sound. You'll find:

• Output device — dropdown showing all available audio outputs (built-in speakers, headphone jack, HDMI, USB audio). Select the one you want to use.
• Output volume — the master volume slider.
• Input device — microphone selection and input volume.
• Alert volume — volume for system notification sounds.
• Test button — plays a short sound to confirm the selected output works.

Linux Mint (Cinnamon) — Sound applet

Right-click the speaker icon in the system tray and choose Sound Settings. Alternatively, open System Settings → Sound. Mint's sound panel is similar to GNOME's but also shows per-application volume levels on the "Applications" tab.

KDE Plasma — Audio Volume widget

Click the speaker icon in the system tray to open the quick volume control. For full settings, right-click the speaker and choose Configure Audio Devices (or open System Settings → Audio). KDE lets you set a default output per application — for example, routing game audio to headphones and notification sounds to speakers.

XFCE / MATE — PulseAudio Volume Control

These desktops use a standalone tool. Search for PulseAudio Volume Control (pavucontrol) in the application menu. If it's not installed:

pavucontrol is actually the most powerful graphical audio tool on Linux regardless of desktop — it shows every audio stream, every device, and lets you reroute streams between devices in real time.

4. pavucontrol — The Audio Power Tool

PulseAudio Volume Control (pavucontrol) works with both PulseAudio and PipeWire and gives you far more control than the basic desktop sound panel. It has five tabs:

• Playback — shows every application currently playing audio, with an individual volume slider for each. You can mute a specific app or adjust its volume independently of the master.
• Recording — shows every application currently recording audio (mic input). Useful for identifying which app has grabbed the microphone.
• Output Devices — lists every audio output (speaker, headphones, HDMI, USB). You can set the default and adjust the volume for each device independently.
• Input Devices — lists every microphone and audio input. Set the default and adjust input gain.
• Configuration — shows the profile for each audio card. This is where you switch between stereo output, surround sound, HDMI audio, and digital output (S/PDIF). This tab fixes most HDMI audio problems.

5. HDMI Audio

HDMI carries audio as well as video, so when you connect a monitor or TV via HDMI you expect audio to come from those speakers. Linux handles this but sometimes needs a nudge to select the right output.

• 1
  Open pavucontrol (or Settings → Sound on GNOME).
• 2
  Click the Configuration tab. You'll see your audio hardware listed — typically something like "Built-in Audio" and possibly a separate GPU audio device (e.g., "NVIDIA High Definition Audio" or "AMD HD Audio").
• 3
  For the GPU audio device, change its profile from "Off" to "Digital Stereo (HDMI)" or the matching HDMI port (HDMI 1, HDMI 2, etc.).
• 4
  Go to the Output Devices tab — the HDMI output should now appear. Click the green tick (✓) button next to it to set it as the default.
• 5
  Test by playing any audio. If using GNOME, you can also set the output in Settings → Sound → Output device dropdown.

6. Bluetooth Audio

Bluetooth headphones and speakers work on Linux, though the initial pairing process is slightly different from Windows or macOS.

Pairing via the graphical interface

• 1
  Put your Bluetooth device into pairing mode.
• 2
  Open Settings → Bluetooth (Ubuntu/GNOME) or the Bluetooth manager from the system tray. Make sure Bluetooth is enabled.
• 3
  Your device should appear in the "Available devices" list. Click it and then click Pair. Confirm any PIN if prompted.
• 4
  After pairing, the Bluetooth headphones should appear in Settings → Sound → Output device. Select them.

Bluetooth audio quality — A2DP profile

Bluetooth audio has two main profiles: A2DP (high-quality stereo audio) and HSP/HFP (low-quality "headset" profile that enables the microphone). Linux sometimes defaults to HSP/HFP because it detects a microphone in the headphones. If your Bluetooth audio sounds terrible, this is why.

Fix it in pavucontrol → Configuration tab → select your Bluetooth device → change profile to "High Fidelity Playback (A2DP Sink)".

7. Terminal Audio Tools

When the GUI isn't enough — or when you're troubleshooting over SSH on a headless system — the terminal provides complete control over audio.

List output devices

Set the default output device

Adjust volume from the terminal

Check ALSA — the layer below PulseAudio/PipeWire

8. Troubleshooting Common Sound Problems

Chapter Summary