@Jacopo, I think this problem may be an incompatibility issue between the PulseAudio driver (if driver is the correct term) and the ALC1220 chipset/codec. I used this procedure to disable PulseAudio and found that I could record normally (link follows):
https://kodi.wiki/view/PulseAudio/HOW- TO:_Disable_PulseAudio_and_use_ALSA_(without_removing_PulseAudio)_for_Ubuntu Disabling PulseAudio will also disable HDMI out. I use the affected machine for home theater so I must enable PulseAudio for that. The linked procedure is simple but requires some time and a reboot. Ultimately, it would be nice for a computer coder (perhaps associated with PulseAudio) to get PulseAudio to work with the ALC1220 chipset/codec. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1764965 Title: [Realtek ALC1220 ASUS PRIME X370] Recording is very slow and plays 10x faster To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1764965/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs