Ubuntu Default Audio Input Is Muted after Installing the Operating System

Ubuntu’s Default Audio Input Is Muted

The first time the end user uses an audio input function (like a microphone) after installing the Ubuntu Operating System, there will be no audio input because the sound input volume is set to mute in settings.

Affected Platforms:

• Latitude 3340
• Latitude 3440
• Latitude 3540

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The Capture Switch has changed to Dmic0 Capture Switch, and the ucm (use case manager) did not config it to default on, so it is off by default.

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Method 1

Adjust the audio input volume by System Settings → Sound → Input Volume.

Figure 1 - Sound Settings

Method 2

Adjust the audio input volume by setting in the application (for example zoom).

The Fix

Upgrade Ubuntu when an online update is available.

Method 1

1. Open Terminal on Ubuntu
2. Run the following commands: sudo apt update

   

3. Run the following commands: sudo apt upgrade

   

4. Restart the Computer

Method 2

1. The automatic system update notifications appear on the desktop once an online update is available. Or open Software Updater

   

2. Click Install Now to download and install updates.

   

3. Restart the Computer

This solution is to set the Capture switch default on. Plan to Factory Install (FI) cut in May block.

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