In this tutorial we will help you get the CMEDIA USB 7.1 Channel sound adapter as your primary sound card under an Ubuntu / Debian-based system. If you plug this device and have no sound, then this tutorial may help you solve this problem. You can find here the reference we have based our tutorial on.
Open the terminal and install first these packages:
sudo apt-get install alsa-tools alsa-oss
Edit now the /etc/modprobe.d/alsa-base.conf file with this command:
sudo gedit /etc/modprobe.d/alsa-base.conf
At the end of the file, you will find these two lines:
# Keep snd-usb-audio from being loaded as first soundcard
options snd-usb-audio index=-2
Replace the value -2 with 0 to set your USB sound adapter as your primary sound card, then press Ctrl+Q and save the file.
When you finish, reboot your system, then open the terminal and run this command:
And adjust your device volume: