1) Eseguito il seguente comando:
~$ cat /proc/asound/card0/codec* | grep Codec
2) Output:
Realtek ALC660-VD
Codec: Motorola Si3054
3) In HD-Audio_models.txt trovo:
ALC861VD/660VD
==============
3stack 3-jack
3stack-dig 3-jack with SPDIF OUT
6stack-dig 6-jack with SPDIF OUT
3stack-660 3-jack (for ALC660VD)
3stack-660-digout 3-jack with SPDIF OUT (for ALC660VD)
lenovo Lenovo 3000 C200
dallas Dallas laptops
hp HP TX1000
asus-v1s ASUS V1Sn
auto auto-config reading BIOS (default)
4) Cosa devo scegliere? Boh, ho optato per 3stack-660 (che da tabella dovrebbe essere specifico per ALC660VD)
5) Incollato in alsa-base.conf la seguente riga finale:
options snd-hda-intel model=3stack-660
(mediante sudo gedit /etc/modprobe.d/alsa-base.conf)
6) Riavviato ALSA col comando:
sudo alsa force-reload
7) Output a terminale:
lsof: WARNING: can't stat() fuse.gvfs-fuse-daemon file system /home/sager/.gvfs
Output information may be incomplete.
Terminating processes: 1399lsof: WARNING: can't stat() fuse.gvfs-fuse-daemon file system /home/sager/.gvfs
Output information may be incomplete.
4047lsof: WARNING: can't stat() fuse.gvfs-fuse-daemon file system /home/sager/.gvfs
Output information may be incomplete.
4063lsof: WARNING: can't stat() fuse.gvfs-fuse-daemon file system /home/sager/.gvfs
Output information may be incomplete.
4079lsof: WARNING: can't stat() fuse.gvfs-fuse-daemon file system /home/sager/.gvfs
Output information may be incomplete.
(with SIGKILL:) 4095lsof: WARNING: can't stat() fuse.gvfs-fuse-daemon file system /home/sager/.gvfs
Output information may be incomplete.
(failed: processes still using sound devices: 4111(pulseaudio)).
lsof: WARNING: can't stat() fuse.gvfs-fuse-daemon file system /home/sager/.gvfs
Output information may be incomplete.
/sbin/alsa: Warning: Processes using sound devices: 4111(pulseaudio).
Unloading ALSA sound driver modules: snd-hda-codec-hdmi snd-hda-codec-si3054 snd-hda-codec-realtek snd-hda-intel snd-hda-codec snd-hwdep snd-pcm snd-seq-midi snd-rawmidi snd-seq-midi-event snd-seq snd-timer snd-seq-device snd-page-alloc (failed: modules still loaded: snd-hda-codec-hdmi snd-hda-codec-si3054 snd-hda-codec-realtek snd-hda-intel snd-hda-codec snd-hwdep snd-pcm snd-timer snd-page-alloc).
Loading ALSA sound driver modules: snd-hda-codec-hdmi snd-hda-codec-si3054 snd-hda-codec-realtek snd-hda-intel snd-hda-codec snd-hwdep snd-pcm snd-seq-midi snd-rawmidi snd-seq-midi-event snd-seq snd-timer snd-seq-device snd-page-alloc.

Siccome il portatile è un Asus, ho provato anche con:
options snd-hda-intel model=asus-vls
9) Esito: idem con patate.
10) Verifico l'aggiornamento del driver che è: alsactl version 1.0.24.2
E' la versione più aggiornata.
Morale: boh, con Ubuntu non funziona mai un tubo di niente. Qualcuno sa aiutarmi? Grazie. Se attacco la cuffia a Windows funziona egregiamente. La vecchia come la nuova. Dove ho sbagliato?