When installing Ubuntu as the host operating system on a Fujitsu Lifebook, you may notice that the microphone doesn’t work by default. While the fix is simple, locating the solution on your own requires a good understanding of Debian-based filesystems.
Follow these steps to enable the microphone:
Open the Terminal
Launch the terminal and create or edit a configuration file in the following location:
sudo nano /etc/modprobe.d/alsa-base.conf
Add the Required Configuration
This file should already exist and contain some text. Scroll to the end of the file and add the following line:
options snd_sof_intel_hda_common dmic_num=4
Save and Exit
After adding the line, save the file and exit the editor.
Restart the System (if necessary)
In most cases, the microphone should start working immediately. If it doesn’t, reboot your system to apply the changes.