No sound in Ubuntu Breezy with an onboard AC97 sound card

I have just downloaded and installed Breezy, since I wasn't able to get my sound
running on Hoary. It isn't working on Breezy either.
I have tried the usuals: unmuted channels, chmodded /dev/dsp to 666

Some things that might be useful:

----- lspci -v |grep -i audio -----
0000:00:1f.5 Multimedia audio controller: Intel Corp. 82801BA/BAM AC'97 Audio
(rev 11)

----- ls /proc/asound -----
card0 cards I82801BAICH2 oss seq UART
card1 devices modules pcm timers version

----- lspci -----
0000:00:00.0 Host bridge: Intel Corp. 82815 815 Chipset Host Bridge and Memory
Controller Hub (rev 04)
0000:00:01.0 PCI bridge: Intel Corp. 82815 815 Chipset AGP Bridge (rev 04)
0000:00:1e.0 PCI bridge: Intel Corp. 82801 PCI Bridge (rev 11)
0000:00:1f.0 ISA bridge: Intel Corp. 82801BA ISA Bridge (LPC) (rev 11)
0000:00:1f.1 IDE interface: Intel Corp. 82801BA IDE U100 (rev 11)
0000:00:1f.2 USB Controller: Intel Corp. 82801BA/BAM USB (Hub #1) (rev 11)
0000:00:1f.3 SMBus: Intel Corp. 82801BA/BAM SMBus (rev 11)
0000:00:1f.4 USB Controller: Intel Corp. 82801BA/BAM USB (Hub #2) (rev 11)
0000:00:1f.5 Multimedia audio controller: Intel Corp. 82801BA/BAM AC'97 Audio
(rev 11)
0000:01:00.0 VGA compatible controller: nVidia Corporation NV6 [Vanta/Vanta LT]
(rev 15)

I hope this is useful.