[RESOLU]
Voici la solution , en anglais :
While Linux kernel 5.5 and above versions has improved support for this model, it is still tricky for Ubuntu 18.04 and Mint 19 users because the kernel in use is still 5.3.
Check your Linux kernel version and if it is 5.4 or lower, try this possible workaround that is suggested by Arch Linux and Ubuntu developers.
Open the alsa configuration file (command might be different for Mint because Gedit text editor is not used in Mint):
sudo gedit /etc/modprobe.d/alsa-base.conf
Add the following line to the end of this file:
options snd-hda-intel dmic_detect=0
Save and close the file and reboot your system.
You should have the audio back.