exactly the same problem. model=mbp3 works!
$ sudo dmidecode -s system-product-name iMac8,1
$ cat /etc/lsb-release $ DISTRIB_ID=Ubuntu DISTRIB_RELEASE=11.10 DISTRIB_CODENAME=oneiric DISTRIB_DESCRIPTION="Ubuntu 11.10"
cat /proc/asound/card0/codec#* | grep Codec Codec: Realtek ALC889A
exactly the same problem. model=mbp3 works!
$ sudo dmidecode -s system-product-name
iMac8,1
$ cat /etc/lsb-release $ RELEASE= 11.10 CODENAME= oneiric DESCRIPTION= "Ubuntu 11.10"
DISTRIB_ID=Ubuntu
DISTRIB_
DISTRIB_
DISTRIB_
cat /proc/asound/ card0/codec# * | grep Codec
Codec: Realtek ALC889A