C'est la première chose que j'ai vérifé ^^.

Pareil pour les différents périphériques, tous essayé, aucun ne me renvois le moindre "pcchhht" ....

Je pense que oui (je débarque sur Ubuntu).

La commence ps ax | grep pulse me renvoies :

 3648 ?        Ss     0:00 /usr/bin/ssh-agent /usr/bin/dbus-launch --exit-with-session /usr/bin/pulse-session /usr/bin/seahorse-agent --execute x-session-manager
 3651 ?        S      0:00 /usr/bin/dbus-launch --exit-with-session /usr/bin/pulse-session /usr/bin/seahorse-agent --execute x-session-manager
 3657 ?        Ssl    2:13 /usr/bin/pulseaudio --start
 3658 ?        S      0:00 /usr/lib/pulseaudio/pulse/gconf-helper
24459 pts/0    S+     0:00 grep pulse

lsmod | grep snd :

snd_hda_codec_atihdmi    11520  1 
snd_hda_codec_idt      64512  1 
snd_hda_intel          33608  5 
snd_hda_codec          76800  3 snd_hda_codec_atihdmi,snd_hda_codec_idt,snd_hda_intel
snd_hwdep              15236  1 snd_hda_codec
snd_pcm_oss            45984  0 
snd_mixer_oss          22656  1 snd_pcm_oss
snd_seq_oss            39296  0 
snd_pcm                82820  4 snd_hda_intel,snd_hda_codec,snd_pcm_oss
snd_seq_midi_event     15232  1 snd_seq_oss
snd_seq                57584  4 snd_seq_oss,snd_seq_midi_event
snd_timer              29320  2 snd_pcm,snd_seq
snd_seq_device         15372  2 snd_seq_oss,snd_seq
snd                    66596  20 snd_hda_codec_idt,snd_hda_intel,snd_hda_codec,snd_hwdep,snd_­pcm_oss,snd_mixer_oss,snd_seq_oss,snd_pcm,snd_seq,snd_timer,­snd_seq_device
soundcore              15200  1 snd
snd_page_alloc         17032  2 snd_hda_intel,snd_pcm

cat: /etc/modprobe.d/alsa-base: Aucun fichier ou dossier de ce type

Ils se terminent tous par .conf :p :

total 40
-rw-r--r-- 1 root root 2422 2009-05-08 16:31 alsa-base.conf
-rw-r--r-- 1 root root 2387 2009-04-08 19:42 alsa-base.conf~
-rw-r--r-- 1 root root  325 2009-05-08 14:14 blacklist-ath_pci.conf
-rw-r--r-- 1 root root 1467 2009-03-18 17:02 blacklist.conf
-rw-r--r-- 1 root root  213 2009-03-18 17:02 blacklist-firewire.conf
-rw-r--r-- 1 root root  662 2009-03-18 17:02 blacklist-framebuffer.conf
-rw-r--r-- 1 root root  156 2009-04-08 19:42 blacklist-modem.conf
lrwxrwxrwx 1 root root   41 2009-05-07 18:35 blacklist-oss.conf -> /lib/linux-sound-base/noOSS.modprobe.conf
-rw-r--r-- 1 root root  838 2009-03-18 17:02 blacklist-watchdog.conf
-rw-r--r-- 1 root root   45 2009-03-05 17:31 dkms.conf
-rw-r--r-- 1 root root   16 2009-03-05 19:57 libpisock9.conf

Bien bien.

Alors voila le résultat de alsa-base.conf :

# autoloader aliases
install sound-slot-0 /sbin/modprobe snd-card-0
install sound-slot-1 /sbin/modprobe snd-card-1
install sound-slot-2 /sbin/modprobe snd-card-2
install sound-slot-3 /sbin/modprobe snd-card-3
install sound-slot-4 /sbin/modprobe snd-card-4
install sound-slot-5 /sbin/modprobe snd-card-5
install sound-slot-6 /sbin/modprobe snd-card-6
install sound-slot-7 /sbin/modprobe snd-card-7

# Cause optional modules to be loaded above generic modules
install snd /sbin/modprobe --ignore-install snd $CMDLINE_OPTS && { /sbin/modprobe --quiet --use-blacklist snd-ioctl32 ; /sbin/modprobe --quiet --use-blacklist snd-seq ; }
#
# Workaround at bug #499695 (reverted in Ubuntu see LP #319505)
install snd-pcm /sbin/modprobe --ignore-install snd-pcm $CMDLINE_OPTS && { /sbin/modprobe --quiet --use-blacklist snd-pcm-oss ; : ; }
install snd-mixer /sbin/modprobe --ignore-install snd-mixer $CMDLINE_OPTS && { /sbin/modprobe --quiet --use-blacklist snd-mixer-oss ; : ; }
install snd-seq /sbin/modprobe --ignore-install snd-seq $CMDLINE_OPTS && { /sbin/modprobe --quiet --use-blacklist snd-seq-midi ; /sbin/modprobe --quiet --use-blacklist snd-seq-oss ; : ; }
#
install snd-rawmidi /sbin/modprobe --ignore-install snd-rawmidi $CMDLINE_OPTS && { /sbin/modprobe --quiet --use-blacklist snd-seq-midi ; : ; }
# Cause optional modules to be loaded above sound card driver modules
install snd-emu10k1 /sbin/modprobe --ignore-install snd-emu10k1 $CMDLINE_OPTS && { /sbin/modprobe --quiet --use-blacklist snd-emu10k1-synth ; }
install snd-via82xx /sbin/modprobe --ignore-install snd-via82xx $CMDLINE_OPTS && { /sbin/modprobe --quiet --use-blacklist snd-seq ; }

# Load saa7134-alsa instead of saa7134 (which gets dragged in by it anyway)
install saa7134 /sbin/modprobe --ignore-install saa7134 $CMDLINE_OPTS && { /sbin/modprobe --quiet --use-blacklist saa7134-alsa ; : ; }
# Prevent abnormal drivers from grabbing index 0
options bt87x index=-2
options cx88_alsa index=-2
options saa7134-alsa index=-2
options snd-atiixp-modem index=-2
options snd-intel8x0m index=-2
options snd-via82xx-modem index=-2
options snd-usb-audio index=-2
options snd-usb-us122l index=-2
options snd-usb-usx2y index=-2
options snd-usb-caiaq index=-2
# Ubuntu #62691, enable MPU for snd-cmipci
options snd-cmipci mpu_port=0x330 fm_port=0x388
# Keep snd-pcsp from beeing loaded as first soundcard
options snd-pcsp index=-2
options snd-hda-intel model=laptop