Buzz noise audio - KDE

Change your working directory to /etc/modprobe.d:

cd /etc/modprobe.d

And now, create a new file named audio_disable_powersave.conf and open with the nano text editor using the given command:

sudo nano audio_disable_powersave.conf

And put the following lines in that file to turn off the power-saving setting in the sound card permanently:

options snd_hda_intel power_save=0

For a USB sound card, you can use snd_usb_audio:

options snd_usb_audio power_save=0

Now, save changes and exit the Nano text editor by pressing Ctrl+X keys. Reboot your system, and you can enjoy a noise-free workspace.