I am having the same problem on a Dell Inspiron 1525 laptop (running the same kernel) with a
$ lspci 00:1b.0 Audio device: Intel Corporation 82801H (ICH8 Family) HD Audio Controller (rev 02)
$ head -n 5 /proc/asound/card0/codec#0 Codec: Conexant ID 2c06 Address: 0 Vendor Id: 0x14f12c06 Subsystem Id: 0x14f1000f Revision Id: 0x100000
Sound works just fine with ubuntu 7.10, so I am glad I did not do an upgrade, yet, but installed 8.04 on an extra partition.
I am having the same problem on a Dell Inspiron 1525 laptop (running the same kernel) with a
$ lspci
00:1b.0 Audio device: Intel Corporation 82801H (ICH8 Family) HD Audio Controller (rev 02)
$ head -n 5 /proc/asound/ card0/codec# 0
Codec: Conexant ID 2c06
Address: 0
Vendor Id: 0x14f12c06
Subsystem Id: 0x14f1000f
Revision Id: 0x100000
Sound works just fine with ubuntu 7.10, so I am glad I did not do an upgrade, yet, but installed 8.04 on an extra partition.