edgy no sound card vaio 505g

New install of xubuntu 6.10 from alternate cd on Sony VAIO PCG-505G. All hardware detected and working great EXCEPT for no sound! The VAIO's own "boot sound" works, and I can get "system beeps" (?) when a program such as alsamixergui returns an error message. Unfortunately I have no idea what sound chip this machine uses - can't find any specs from Sony, and I've deleted the Win98 install on this machine to run xubuntu so I can't check from there. I have run Update Manager and installed all of the available updates, but to no avail.

DUMPED STUFF:

oem@xubuntu:~$ lspci -v
00:00.0 Host bridge: Intel Corporation 430TX - 82439TX MTXC (rev 01)
        Flags: bus master, medium devsel, latency 32

00:07.0 Bridge: Intel Corporation 82371AB/EB/MB PIIX4 ISA (rev 02)
        Flags: bus master, medium devsel, latency 0

00:07.1 IDE interface: Intel Corporation 82371AB/EB/MB PIIX4 IDE (rev 01) (prog-if 80 [Master])
        Flags: bus master, medium devsel, latency 64
        I/O ports at fcf0 [size=16]

00:07.2 USB Controller: Intel Corporation 82371AB/EB/MB PIIX4 USB (rev 01) (prog-if 00 [UHCI])
        Flags: bus master, medium devsel, latency 64, IRQ 9
        I/O ports at fcc0 [size=32]

00:07.3 Bridge: Intel Corporation 82371AB/EB/MB PIIX4 ACPI (rev 02)
        Flags: medium devsel, IRQ 9

00:08.0 VGA compatible controller: Neomagic Corporation NM2160 [MagicGraph 128XD] (rev 01) (prog-if 00 [VGA])
        Subsystem: Sony Corporation MagicGraph 128XD
        Flags: bus master, medium devsel, latency 128, IRQ 9
        Memory at fd000000 (32-bit, prefetchable) [size=16M]
        Memory at fea00000 (32-bit, non-prefetchable) [size=2M]
        Memory at fed00000 (32-bit, non-prefetchable) [size=1M]

00:0a.0 CardBus bridge: Ricoh Co Ltd RL5c475
        Subsystem: Sony Corporation Unknown device 8030
        Flags: bus master, medium devsel, latency 168, IRQ 9
        Memory at 14000000 (32-bit, non-prefetchable) [size=4K]
        Bus: primary=00, secondary=01, subordinate=04, sec-latency=176
        Memory window 0: 10000000-11fff000 (prefetchable)
        Memory window 1: 12000000-13fff000
        I/O window 0: 00001000-000010ff
        I/O window 1: 00001400-000014ff
        16-bit legacy interface ports at 0001

oem@xubuntu:~$ aplay -l
aplay: device_list:222: no soundcards found...

oem@xubuntu:~$ aplay
ALSA lib confmisc.c:670:(snd_func_card_driver) cannot find card '0'
ALSA lib conf.c:3479:(_snd_config_evaluate) function snd_func_card_driver returned error: No such device
ALSA lib confmisc.c:391:(snd_func_concat) error evaluating strings
ALSA lib conf.c:3479:(_snd_config_evaluate) function snd_func_concat returned error: No such device
ALSA lib confmisc.c:1070:(snd_func_refer) error evaluating name
ALSA lib conf.c:3479:(_snd_config_evaluate) function snd_func_refer returned error: No such device
ALSA lib conf.c:3947:(snd_config_expand) Evaluate error: No such device
ALSA lib pcm.c:2146:(snd_pcm_open_noupdate) Unknown PCM default
aplay: main:547: audio open error: No such device

oem@xubuntu:~$ lsmod
Module Size Used by
apm 23280 1
ipv6 272288 12
cpufreq_userspace 5408 0
cpufreq_stats 7744 0
freq_table 6048 1 cpufreq_stats
cpufreq_powersave 2944 0
cpufreq_ondemand 8876 0
cpufreq_conservative 8712 0
af_packet 24584 2
lp 12964 0
hostap_cs 64788 0
hostap 123012 1 hostap_cs
ieee80211_crypt 7552 1 hostap
orinoco_cs 17540 1
orinoco 45076 1 orinoco_cs
hermes 9472 2 orinoco_cs,orinoco
tsdev 9152 0
pcmcia 40380 2 hostap_cs,orinoco_cs
irtty_sir 10112 0
sir_dev 18308 1 irtty_sir
serio_raw 8452 0
irda 214332 2 irtty_sir,sir_dev
crc_ccitt 3200 1 irda
evdev 11392 1
psmouse 41352 0
parport_pc 37796 1
floppy 63044 0
parport 39496 2 lp,parport_pc
i2c_piix4 10000 0
i2c_core 23424 1 i2c_piix4
pcspkr 4352 0
yenta_socket 28812 3
rsrc_nonstatic 15360 1 yenta_socket
pcmcia_core 43924 5 hostap_cs,orinoco_cs,pcmcia,yenta_socket,rsrc_nonstatic
ext3 142728 1
jbd 62228 1 ext3
usbhid 45152 0
ide_generic 2432 0
uhci_hcd 24968 0
usbcore 134912 3 usbhid,uhci_hcd
ide_disk 18560 3
piix 11780 1
generic 6276 0
processor 31560 0
fbcon 41504 0
tileblit 3840 1 fbcon
font 9344 1 fbcon
bitblit 7168 1 fbcon
softcursor 3328 1 bitblit
vesafb 9244 0
capability 5896 0
commoncap 8704 1 capability