Ubuntu stuff

gistfile1.txt

https://askubuntu.com/a/1230834

It was happening because Ubuntu turned on the sound card power-saving capabilities. Turning it off can be the only way to get rid of the annoying sound:

Verify how is your sound card's power_save parameter:

cat /sys/module/snd_hda_intel/parameters/power_save
If it returns 1, do the following to change it temporally:

echo "0" | sudo tee /sys/module/snd_hda_intel/parameters/power_save
If the previous step worked for you, persist that configuration (otherwise the problem will continue after reboot):

echo "options snd_hda_intel power_save=0" | sudo tee -a /etc/modprobe.d/audio_disable_powersave.conf
(Optional) You can also do the same for power_save_controller parameter following the steps 1, 2 and 3 replacing power_save by power_save_controller also changing 0 to N.

Note: using the first step will probably return Y for this parameter, instead of 1.